面试题 01.03. String to URL LCCI

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Problem

Write a method to replace all spaces in a string with ‘%20’. You may assume that the string has sufficient space at the end to hold the additional characters,and that you are given the “true” length of the string. (Note: If implementing in Java,please use a character array so that you can perform this operation in place.)

Example1

Input: "Mr John Smith ", 13
Output: “Mr%20John%20Smith”

Example2

Input: " ", 5
Output: “%20%20%20%20%20”

Solution

class Solution {
public:string replaceSpaces(string S, int length) {string ret = "";if(length == 0)return ret;for(int i = 0;i<length;++i){if(S[i] == ' '){ret += "%20";}else{ret += S[i];}}return ret;}
};

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