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647. Palindromic Substrings Medium 2458109Add to ListShare Given a string, your task is to count how many palindromic substrings in this string. The s 阅读全文
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Given an integer, write a function to determine if it is a power of two. Example 1: Input: 1 Output: true Explanation: 20 = 1 Example 2: Input: 16 Out 阅读全文
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In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given 阅读全文
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1143. Longest Common Subsequence Medium 132115Add to ListShare Given two strings text1 and text2, return the length of their longest common subsequenc 阅读全文