ych_ding的专栏

问题描述： The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S

问题描述： https://oj.leetcode.com/problems/count-and-say/ 点击打开链接 The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1"

问题描述： 字符串循环左移k位 问题分析： s[0, n-1] 待移位字符串 1. reverse s[0, k - 1] 2. reverse s[k, n - 1] 3. reverse s[0, n - 1] 示例代码： voide reverse(char s[], int start, int end) { int i = start, j = end;

问题描述： https://oj.leetcode.com/problems/valid-palindrome/ Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a pl