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Two Pointers Problem

K-diff Pairs in an Array (Easy Amazon)Two Sum - Unique pairs 3Sum 4Sum 4Sum II Two Sum - Less than or equal to target Sort Colors Sort Colors II Window Sum Valid Triangle Number Partition Array II Max Consecutive Ones II Reverse Vowels of a String （easy）Trapping Rain Water 1498. Number of Subsequences That Satisfy the Given Sum Condition Substring With At Least K Distinct Characters Minimum Window Substring Two Sum VII the kth subarray

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