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hard Solve on LeetCodeLast edited: August 2, 2025

Problem
Examples
Example 1
Example 2
Example 3
Constraints
Solution
Method 1 - Using visited array
Code
Complexity
Method 2 - Using Segment tree
How the Segment Tree Works
Code
Complexity

Related Tags

backtracking bit-manipulation bitmask breadth-first-search counting database design dynamic-programming enumeration greedy hash-function hash-table heap-priority-queue leetcode math matrix ordered-set prefix-sum rolling-hash segment-tree simulation sorting string todo two-pointers

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