摘要：原题链接 "https://leetcode.com/problems/number complement/" 原题 Given a positive integer, output its complement number. The complement strategy is to flip 阅读全文

摘要：原题 Given two strings s and t which consist of only lowercase letters. String t is generated by random shuffling string s and then add one more letter 阅读全文

摘要：Given two strings s and t, determine if they are isomorphic.Two strings are isomorphic if the characters in s can be replaced to get t.All occurrences... 阅读全文