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摘要： 551. Student Attendance Record I【easy】 You are given a string representing an attendance record for a student. The record only contains the following 阅读全文

摘要： 383. Ransom Note【easy】 Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will 阅读全文

摘要： 657. Judge Route Circle【easy】 Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which 阅读全文

摘要： 606. Construct String from Binary Tree 【easy】 You need to construct a string consists of parenthesis and integers from a binary tree with the preorder 阅读全文

摘要： 520. Detect Capital【easy】 Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a wo 阅读全文

摘要： 28. Implement strStr()【easy】 Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of hayst 阅读全文

摘要： 521. Longest Uncommon Subsequence I【easy】 Given a group of two strings, you need to find the longest uncommon subsequence of this group of two strings 阅读全文

摘要： 344. Reverse String【easy】 Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 解法 阅读全文

摘要： 557. Reverse Words in a String III【easy】 Given a string, you need to reverse the order of characters in each word within a sentence while still preser 阅读全文

摘要： 680. Valid Palindrome II【easy】 Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1 阅读全文