Longest Common Prefix
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问题描述:Longest Common Prefix
Write a function to find the longest common prefix string amongst an array of strings.
思路:在这个问题中,我们要找到所有字符串的公共前缀,最简单的方法就是从第一个字符串的第一位开始往后取,直到找到最大的公共字符串为止,那么这个条件是啥呢?第一个条件是当公共字符串的个数大于等于某个字符串的长度时,第二个条件是当字符串中出现某两个字符串的下一位不相等时。
1. abc,abd,ab
2. abc,abd,abf
代码:
#include<iostream>#include<vector>#include<string>using namespace std;string longestCommonPrefix(vector<string>& strs){ string prefix = ""; for(int i = 0; strs.size() > 0; prefix += strs[0][i],i++){ for(int j = 0; j < strs.size(); ++j){ if(i >= strs[j].size() || (j > 0 && strs[j][i] != strs[j-1][i])){ return prefix; } } } return prefix;}int main(){ vector<string> a; a.push_back("abc"); a.push_back("abd"); a.push_back("ab"); for(int i=0;i<a.size();++i) cout<<a[i]<<endl; cout<<"result: "<<longestCommonPrefix(a)<<endl;}
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