Longest Common Prefix
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难度:2
求所有串的最长公共前缀
解法:
枚举每个位置
class Solution{public: string longestCommonPrefix(vector<string> &strs) { if(strs.size()<=0) return ""; int min_len=strs[0].size(); for(int i=1;i<strs.size();i++) { min_len=min(min_len,(int)strs[i].size()); } //min_len已求出 for(int i=0;i<min_len;i++) { // bool flag=true; for(int j=1;j<strs.size();j++) { //strs[j] if(strs[j][i]!=strs[0][i]) { flag=false; break; } } if(!flag) { return strs[0].substr(0,i); } } return strs[0].substr(0,min_len); }};
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