https://leetcode-solutions-5zk.pages.dev/tags/stack/Recent content in Stack on LeetCode 题解笔记Hugozh-cn2026 ZenzZweiMon, 11 May 2026 12:12:02 +0800https://leetcode-solutions-5zk.pages.dev/posts/1896-minimum-cost-to-change-the-final-value-of-expression/Wed, 06 May 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1896-minimum-cost-to-change-the-final-value-of-expression/Hard | Math, String, Dynamic Programming, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0770-basic-calculator-iv/Wed, 06 May 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0770-basic-calculator-iv/Hard | Hash Table, Math, String, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/1776-car-fleet-ii/Thu, 30 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1776-car-fleet-ii/Hard | Array, Math, Stack, Heap (Priority Queue), Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2019-the-score-of-students-solving-math-expression/Thu, 30 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2019-the-score-of-students-solving-math-expression/Hard | Array, Hash Table, Math, String, Dynamic Programming, Stack, Memoizationhttps://leetcode-solutions-5zk.pages.dev/posts/1003-check-if-word-is-valid-after-substitutions/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1003-check-if-word-is-valid-after-substitutions/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1504-count-submatrices-with-all-ones/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1504-count-submatrices-with-all-ones/Medium | Array, Dynamic Programming, Stack, Matrix, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0020-valid-parentheses/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0020-valid-parentheses/Easy | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0488-zuma-game/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0488-zuma-game/Hard | String, Dynamic Programming, Stack, Breadth-First Search, Memoizationhttps://leetcode-solutions-5zk.pages.dev/posts/0735-asteroid-collision/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0735-asteroid-collision/Medium | Array, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/0736-parse-lisp-expression/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0736-parse-lisp-expression/Hard | Hash Table, String, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/0844-backspace-string-compare/Wed, 29 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0844-backspace-string-compare/Easy | Two Pointers, String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/3229-minimum-operations-to-make-array-equal-to-target/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3229-minimum-operations-to-make-array-equal-to-target/Hard | Array, Dynamic Programming, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3412-find-mirror-score-of-a-string/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3412-find-mirror-score-of-a-string/Medium | Hash Table, String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/3420-count-non-decreasing-subarrays-after-k-operations/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3420-count-non-decreasing-subarrays-after-k-operations/Hard | Array, Stack, Segment Tree, Queue, Sliding Window, Monotonic Stack, Monotonic Queuehttps://leetcode-solutions-5zk.pages.dev/posts/3430-maximum-and-minimum-sums-of-at-most-size-k-subarrays/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3430-maximum-and-minimum-sums-of-at-most-size-k-subarrays/Hard | Array, Math, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3523-make-array-non-decreasing/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3523-make-array-non-decreasing/Medium | Array, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3542-minimum-operations-to-convert-all-elements-to-zero/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3542-minimum-operations-to-convert-all-elements-to-zero/Medium | Array, Hash Table, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3561-resulting-string-after-adjacent-removals/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3561-resulting-string-after-adjacent-removals/Medium | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/3638-maximum-balanced-shipments/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3638-maximum-balanced-shipments/Medium | Array, Dynamic Programming, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3676-count-bowl-subarrays/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3676-count-bowl-subarrays/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3703-remove-k-balanced-substrings/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3703-remove-k-balanced-substrings/Medium | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/3746-minimum-string-length-after-balanced-removals/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3746-minimum-string-length-after-balanced-removals/Medium | String, Stack, Countinghttps://leetcode-solutions-5zk.pages.dev/posts/3816-lexicographically-smallest-string-after-deleting-duplicate-characters/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3816-lexicographically-smallest-string-after-deleting-duplicate-characters/Hard | Hash Table, String, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3834-merge-adjacent-equal-elements/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3834-merge-adjacent-equal-elements/Medium | Array, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/3878-count-good-subarrays/Mon, 27 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3878-count-good-subarrays/Hard | Array, Stack, Bit Manipulation, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3113-find-the-number-of-subarrays-where-boundary-elements-are-maximum/Sun, 26 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3113-find-the-number-of-subarrays-where-boundary-elements-are-maximum/Hard | Array, Binary Search, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/3170-lexicographically-minimum-string-after-removing-stars/Sun, 26 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3170-lexicographically-minimum-string-after-removing-stars/Medium | Hash Table, String, Stack, Greedy, Heap (Priority Queue)https://leetcode-solutions-5zk.pages.dev/posts/3174-clear-digits/Sun, 26 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/3174-clear-digits/Easy | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2645-minimum-additions-to-make-valid-string/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2645-minimum-additions-to-make-valid-string/Medium | String, Dynamic Programming, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/2696-minimum-string-length-after-removing-substrings/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2696-minimum-string-length-after-removing-substrings/Easy | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2736-maximum-sum-queries/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2736-maximum-sum-queries/Hard | Array, Binary Search, Stack, Binary Indexed Tree, Segment Tree, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2751-robot-collisions/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2751-robot-collisions/Hard | Array, Stack, Sorting, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2813-maximum-elegance-of-a-k-length-subsequence/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2813-maximum-elegance-of-a-k-length-subsequence/Hard | Array, Hash Table, Stack, Greedy, Sorting, Heap (Priority Queue)https://leetcode-solutions-5zk.pages.dev/posts/2816-double-a-number-represented-as-a-linked-list/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2816-double-a-number-represented-as-a-linked-list/Medium | Linked List, Math, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2818-apply-operations-to-maximize-score/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2818-apply-operations-to-maximize-score/Hard | Array, Math, Stack, Greedy, Sorting, Monotonic Stack, Number Theoryhttps://leetcode-solutions-5zk.pages.dev/posts/2865-beautiful-towers-i/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2865-beautiful-towers-i/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2866-beautiful-towers-ii/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2866-beautiful-towers-ii/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2940-find-building-where-alice-and-bob-can-meet/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2940-find-building-where-alice-and-bob-can-meet/Hard | Array, Binary Search, Stack, Binary Indexed Tree, Segment Tree, Heap (Priority Queue), Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2945-find-maximum-non-decreasing-array-length/Sat, 25 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2945-find-maximum-non-decreasing-array-length/Hard | Array, Binary Search, Dynamic Programming, Stack, Queue, Monotonic Stack, Prefix Sum, Monotonic Queuehttps://leetcode-solutions-5zk.pages.dev/posts/2030-smallest-k-length-subsequence-with-occurrences-of-a-letter/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2030-smallest-k-length-subsequence-with-occurrences-of-a-letter/Hard | String, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2104-sum-of-subarray-ranges/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2104-sum-of-subarray-ranges/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2116-check-if-a-parentheses-string-can-be-valid/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2116-check-if-a-parentheses-string-can-be-valid/Medium | String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/2130-maximum-twin-sum-of-a-linked-list/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2130-maximum-twin-sum-of-a-linked-list/Medium | Linked List, Two Pointers, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2197-replace-non-coprime-numbers-in-array/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2197-replace-non-coprime-numbers-in-array/Hard | Array, Math, Stack, Number Theoryhttps://leetcode-solutions-5zk.pages.dev/posts/2211-count-collisions-on-a-road/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2211-count-collisions-on-a-road/Medium | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2216-minimum-deletions-to-make-array-beautiful/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2216-minimum-deletions-to-make-array-beautiful/Medium | Array, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/2281-sum-of-total-strength-of-wizards/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2281-sum-of-total-strength-of-wizards/Hard | Array, Stack, Monotonic Stack, Prefix Sumhttps://leetcode-solutions-5zk.pages.dev/posts/2289-steps-to-make-array-non-decreasing/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2289-steps-to-make-array-non-decreasing/Medium | Array, Linked List, Dynamic Programming, Stack, Monotonic Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2296-design-a-text-editor/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2296-design-a-text-editor/Hard | Linked List, String, Stack, Design, Simulation, Doubly-Linked Listhttps://leetcode-solutions-5zk.pages.dev/posts/2334-subarray-with-elements-greater-than-varying-threshold/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2334-subarray-with-elements-greater-than-varying-threshold/Hard | Array, Stack, Union-Find, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2375-construct-smallest-number-from-di-string/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2375-construct-smallest-number-from-di-string/Medium | String, Backtracking, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/2390-removing-stars-from-a-string/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2390-removing-stars-from-a-string/Medium | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/2434-using-a-robot-to-print-the-lexicographically-smallest-string/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2434-using-a-robot-to-print-the-lexicographically-smallest-string/Medium | Hash Table, String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/2454-next-greater-element-iv/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2454-next-greater-element-iv/Hard | Array, Binary Search, Stack, Sorting, Heap (Priority Queue), Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2487-remove-nodes-from-linked-list/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2487-remove-nodes-from-linked-list/Medium | Linked List, Stack, Recursion, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2589-minimum-time-to-complete-all-tasks/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2589-minimum-time-to-complete-all-tasks/Hard | Array, Binary Search, Stack, Greedy, Sortinghttps://leetcode-solutions-5zk.pages.dev/posts/2617-minimum-number-of-visited-cells-in-a-grid/Fri, 24 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2617-minimum-number-of-visited-cells-in-a-grid/Hard | Array, Dynamic Programming, Stack, Breadth-First Search, Union-Find, Heap (Priority Queue), Matrix, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1381-design-a-stack-with-increment-operation/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1381-design-a-stack-with-increment-operation/Medium | Array, Stack, Designhttps://leetcode-solutions-5zk.pages.dev/posts/1441-build-an-array-with-stack-operations/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1441-build-an-array-with-stack-operations/Medium | Array, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/1472-design-browser-history/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1472-design-browser-history/Medium | Array, Linked List, Stack, Design, Doubly-Linked List, Data Streamhttps://leetcode-solutions-5zk.pages.dev/posts/1475-final-prices-with-a-special-discount-in-a-shop/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1475-final-prices-with-a-special-discount-in-a-shop/Easy | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array/Hard | Array, Dynamic Programming, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1541-minimum-insertions-to-balance-a-parentheses-string/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1541-minimum-insertions-to-balance-a-parentheses-string/Medium | String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/1544-make-the-string-great/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1544-make-the-string-great/Easy | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1574-shortest-subarray-to-be-removed-to-make-array-sorted/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1574-shortest-subarray-to-be-removed-to-make-array-sorted/Medium | Array, Two Pointers, Binary Search, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1598-crawler-log-folder/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1598-crawler-log-folder/Easy | Array, String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1614-maximum-nesting-depth-of-the-parentheses/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1614-maximum-nesting-depth-of-the-parentheses/Easy | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1653-minimum-deletions-to-make-string-balanced/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1653-minimum-deletions-to-make-string-balanced/Medium | String, Dynamic Programming, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1673-find-the-most-competitive-subsequence/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1673-find-the-most-competitive-subsequence/Medium | Array, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1700-number-of-students-unable-to-eat-lunch/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1700-number-of-students-unable-to-eat-lunch/Easy | Array, Stack, Queue, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/1717-maximum-score-from-removing-substrings/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1717-maximum-score-from-removing-substrings/Medium | String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/1793-maximum-score-of-a-good-subarray/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1793-maximum-score-of-a-good-subarray/Hard | Array, Two Pointers, Binary Search, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1856-maximum-subarray-min-product/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1856-maximum-subarray-min-product/Medium | Array, Stack, Monotonic Stack, Prefix Sumhttps://leetcode-solutions-5zk.pages.dev/posts/1910-remove-all-occurrences-of-a-substring/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1910-remove-all-occurrences-of-a-substring/Medium | String, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/1944-number-of-visible-people-in-a-queue/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1944-number-of-visible-people-in-a-queue/Hard | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1963-minimum-number-of-swaps-to-make-the-string-balanced/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1963-minimum-number-of-swaps-to-make-the-string-balanced/Medium | Two Pointers, String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/1996-the-number-of-weak-characters-in-the-game/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1996-the-number-of-weak-characters-in-the-game/Medium | Array, Stack, Greedy, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/2000-reverse-prefix-of-word/Thu, 23 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/2000-reverse-prefix-of-word/Easy | Two Pointers, String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1006-clumsy-factorial/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1006-clumsy-factorial/Medium | Math, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/1008-construct-binary-search-tree-from-preorder-traversal/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1008-construct-binary-search-tree-from-preorder-traversal/Medium | Array, Stack, Tree, Binary Search Tree, Monotonic Stack, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/1019-next-greater-node-in-linked-list/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1019-next-greater-node-in-linked-list/Medium | Array, Linked List, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1021-remove-outermost-parentheses/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1021-remove-outermost-parentheses/Easy | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1047-remove-all-adjacent-duplicates-in-string/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1047-remove-all-adjacent-duplicates-in-string/Easy | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1081-smallest-subsequence-of-distinct-characters/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1081-smallest-subsequence-of-distinct-characters/Medium | String, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1096-brace-expansion-ii/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1096-brace-expansion-ii/Hard | Hash Table, String, Backtracking, Stack, Breadth-First Search, Sortinghttps://leetcode-solutions-5zk.pages.dev/posts/1106-parsing-a-boolean-expression/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1106-parsing-a-boolean-expression/Hard | String, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/1111-maximum-nesting-depth-of-two-valid-parentheses-strings/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1111-maximum-nesting-depth-of-two-valid-parentheses-strings/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1124-longest-well-performing-interval/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1124-longest-well-performing-interval/Medium | Array, Hash Table, Stack, Monotonic Stack, Prefix Sumhttps://leetcode-solutions-5zk.pages.dev/posts/1130-minimum-cost-tree-from-leaf-values/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1130-minimum-cost-tree-from-leaf-values/Medium | Array, Dynamic Programming, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1172-dinner-plate-stacks/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1172-dinner-plate-stacks/Hard | Hash Table, Stack, Design, Heap (Priority Queue)https://leetcode-solutions-5zk.pages.dev/posts/1190-reverse-substrings-between-each-pair-of-parentheses/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1190-reverse-substrings-between-each-pair-of-parentheses/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1209-remove-all-adjacent-duplicates-in-string-ii/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1209-remove-all-adjacent-duplicates-in-string-ii/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/1249-minimum-remove-to-make-valid-parentheses/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/1249-minimum-remove-to-make-valid-parentheses/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0726-number-of-atoms/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0726-number-of-atoms/Hard | Hash Table, String, Stack, Sortinghttps://leetcode-solutions-5zk.pages.dev/posts/0739-daily-temperatures/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0739-daily-temperatures/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0768-max-chunks-to-make-sorted-ii/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0768-max-chunks-to-make-sorted-ii/Hard | Array, Stack, Greedy, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0769-max-chunks-to-make-sorted/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0769-max-chunks-to-make-sorted/Medium | Array, Stack, Greedy, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0853-car-fleet/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0853-car-fleet/Medium | Array, Stack, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0856-score-of-parentheses/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0856-score-of-parentheses/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0880-decoded-string-at-index/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0880-decoded-string-at-index/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0895-maximum-frequency-stack/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0895-maximum-frequency-stack/Hard | Hash Table, Stack, Design, Ordered Sethttps://leetcode-solutions-5zk.pages.dev/posts/0897-increasing-order-search-tree/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0897-increasing-order-search-tree/Easy | Stack, Tree, Depth-First Search, Binary Search Tree, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0901-online-stock-span/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0901-online-stock-span/Medium | Stack, Design, Monotonic Stack, Data Streamhttps://leetcode-solutions-5zk.pages.dev/posts/0907-sum-of-subarray-minimums/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0907-sum-of-subarray-minimums/Medium | Array, Dynamic Programming, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0921-minimum-add-to-make-parentheses-valid/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0921-minimum-add-to-make-parentheses-valid/Medium | String, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/0936-stamping-the-sequence/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0936-stamping-the-sequence/Hard | String, Stack, Greedy, Queuehttps://leetcode-solutions-5zk.pages.dev/posts/0946-validate-stack-sequences/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0946-validate-stack-sequences/Medium | Array, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/0962-maximum-width-ramp/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0962-maximum-width-ramp/Medium | Array, Two Pointers, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0975-odd-even-jump/Wed, 22 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0975-odd-even-jump/Hard | Array, Dynamic Programming, Stack, Sorting, Monotonic Stack, Ordered Sethttps://leetcode-solutions-5zk.pages.dev/posts/0496-next-greater-element-i/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0496-next-greater-element-i/Easy | Array, Hash Table, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0503-next-greater-element-ii/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0503-next-greater-element-ii/Medium | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0581-shortest-unsorted-continuous-subarray/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0581-shortest-unsorted-continuous-subarray/Medium | Array, Two Pointers, Stack, Greedy, Sorting, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0589-n-ary-tree-preorder-traversal/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0589-n-ary-tree-preorder-traversal/Easy | Stack, Tree, Depth-First Searchhttps://leetcode-solutions-5zk.pages.dev/posts/0590-n-ary-tree-postorder-traversal/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0590-n-ary-tree-postorder-traversal/Easy | Stack, Tree, Depth-First Searchhttps://leetcode-solutions-5zk.pages.dev/posts/0591-tag-validator/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0591-tag-validator/Hard | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0636-exclusive-time-of-functions/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0636-exclusive-time-of-functions/Medium | Array, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0654-maximum-binary-tree/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0654-maximum-binary-tree/Medium | Array, Divide and Conquer, Stack, Tree, Monotonic Stack, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0678-valid-parenthesis-string/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0678-valid-parenthesis-string/Medium | String, Dynamic Programming, Stack, Greedyhttps://leetcode-solutions-5zk.pages.dev/posts/0682-baseball-game/Tue, 21 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0682-baseball-game/Easy | Array, Stack, Simulationhttps://leetcode-solutions-5zk.pages.dev/posts/0321-create-maximum-number/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0321-create-maximum-number/Hard | Array, Two Pointers, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0331-verify-preorder-serialization-of-a-binary-tree/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0331-verify-preorder-serialization-of-a-binary-tree/Medium | String, Stack, Tree, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0341-flatten-nested-list-iterator/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0341-flatten-nested-list-iterator/Medium | Stack, Tree, Depth-First Search, Design, Queue, Iteratorhttps://leetcode-solutions-5zk.pages.dev/posts/0385-mini-parser/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0385-mini-parser/Medium | String, Stack, Depth-First Searchhttps://leetcode-solutions-5zk.pages.dev/posts/0388-longest-absolute-file-path/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0388-longest-absolute-file-path/Medium | String, Stack, Depth-First Searchhttps://leetcode-solutions-5zk.pages.dev/posts/0394-decode-string/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0394-decode-string/Medium | String, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/0402-remove-k-digits/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0402-remove-k-digits/Medium | String, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0445-add-two-numbers-ii/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0445-add-two-numbers-ii/Medium | Linked List, Math, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0456-132-pattern/Mon, 20 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0456-132-pattern/Medium | Array, Binary Search, Stack, Monotonic Stack, Ordered Sethttps://leetcode-solutions-5zk.pages.dev/posts/0114-flatten-binary-tree-to-linked-list/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0114-flatten-binary-tree-to-linked-list/Medium | Linked List, Stack, Tree, Depth-First Search, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0143-reorder-list/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0143-reorder-list/Medium | Linked List, Two Pointers, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/0144-binary-tree-preorder-traversal/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0144-binary-tree-preorder-traversal/Easy | Stack, Tree, Depth-First Search, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0145-binary-tree-postorder-traversal/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0145-binary-tree-postorder-traversal/Easy | Stack, Tree, Depth-First Search, Binary Treehttps://leetcode-solutions-5zk.pages.dev/posts/0150-evaluate-reverse-polish-notation/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0150-evaluate-reverse-polish-notation/Medium | Array, Math, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0155-min-stack/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0155-min-stack/Medium | Stack, Designhttps://leetcode-solutions-5zk.pages.dev/posts/0173-binary-search-tree-iterator/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0173-binary-search-tree-iterator/Medium | Stack, Tree, Design, Binary Search Tree, Binary Tree, Iteratorhttps://leetcode-solutions-5zk.pages.dev/posts/0224-basic-calculator/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0224-basic-calculator/Hard | Math, String, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/0225-implement-stack-using-queues/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0225-implement-stack-using-queues/Easy | Stack, Design, Queuehttps://leetcode-solutions-5zk.pages.dev/posts/0227-basic-calculator-ii/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0227-basic-calculator-ii/Medium | Math, String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0232-implement-queue-using-stacks/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0232-implement-queue-using-stacks/Easy | Stack, Design, Queuehttps://leetcode-solutions-5zk.pages.dev/posts/0234-palindrome-linked-list/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0234-palindrome-linked-list/Easy | Linked List, Two Pointers, Stack, Recursionhttps://leetcode-solutions-5zk.pages.dev/posts/0316-remove-duplicate-letters/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0316-remove-duplicate-letters/Medium | String, Stack, Greedy, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0032-longest-valid-parentheses/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0032-longest-valid-parentheses/Hard | String, Dynamic Programming, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0042-trapping-rain-water/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0042-trapping-rain-water/Hard | Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0071-simplify-path/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0071-simplify-path/Medium | String, Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0084-largest-rectangle-in-histogram/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0084-largest-rectangle-in-histogram/Hard | Array, Stack, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0085-maximal-rectangle/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0085-maximal-rectangle/Hard | Array, Dynamic Programming, Stack, Matrix, Monotonic Stackhttps://leetcode-solutions-5zk.pages.dev/posts/0094-binary-tree-inorder-traversal/Fri, 17 Apr 2026 00:00:00 +0000https://leetcode-solutions-5zk.pages.dev/posts/0094-binary-tree-inorder-traversal/Easy | Stack, Tree, Depth-First Search, Binary Tree