[LeetCode] Is Subsequence 是子序列
Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case English letters in both s ...
原文：[LeetCode] Wiggle Subsequence 擺動子序列
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference if one exists may be either posi ...
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