pipi666661的专栏

Write a method to decide if two strings are anagrams or not.写一个函数判断两个字符串是否是变位词。O（n）的算法，声明个数组来统计出现的次数#include #include #include using namespace std;bool isAnagram(string x, string y){

读了Hawstein大神的大作，读书笔记记录之，膜拜大神用，给自己增些知识。Implement an algorithm to determine if a string has all unique characters. What if you can not use additional data structures?实现一个算法来判断一个字符串中的字符是否唯一思路：用最小的数

原文：Write code to reverse a C-Style String. (C-String means that “abcd” is represented as five characters, including the null character.)写代码翻转一个C风格的字符串。(C风格的意思是"abcd"需要用5个字符来表示，包含末尾的 结束字符)思

Design an algorithm and write code to remove the duplicate characters in a string without using any additional buffer. NOTE: One or two additional variables are fine. An extra copy of the array is not

Given an image represented by an NxN matrix, where each pixel in the image is 4 bytes, write a method to rotate the image by 90 degrees. Can you do this in place?一张图像表示成NxN的矩阵，图像中每个像素是4个字节，写一个函数把图

Write an algorithm such that if an element in an MxN matrix is 0, its entire row and column is set to 0.写一个函数处理一个MxN的矩阵，如果矩阵中某个元素为0，那么把它所在的行和列都置为0.#include #include #include using namespa

Assume you have a method isSubstring which checks if one word is a substring of another. Given two strings, s1 and s2, write code to check if s2 is a rotation of s1 using only one call to isSubstring

Write a method to replace all spaces in a string with ‘%20’.写一个函数，把字符串中所有的空格替换为%20 。