2976. 最小代价转换字符串 I
Medium | Array, String, Graph Theory, Shortest Path
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2977. 字符串转换的最小成本 II
Hard | Array, String, Dynamic Programming, Graph Theory, Trie, Shortest Path
2980. 检查按位或运算是否有尾随零
Easy | Array, Bit Manipulation
2981. 找出至少出现三次的最长特殊子字符串 I
Medium | Hash Table, String, Binary Search, Sliding Window, Counting
2982. 找出出现至少三次的最长特殊子字符串 II
Medium | Hash Table, String, Binary Search, Sliding Window, Counting
2983. 回文重新排列查询
Hard | Array, Hash Table, String, Prefix Sum
2996. 大于序列前缀和的最小缺失整数
Easy | Array, Hash Table, Sorting
2997. 使数组异或等于 K 的最少操作次数
Medium | Array, Bit Manipulation
2998. 使 X 和 Y 相等的最少操作次数
Medium | Dynamic Programming, Breadth-First Search, Memoization
2999. 统计强大整数的数目
Hard | Math, String, Dynamic Programming