leetcode 14. Longest Common Prefix
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寻找字符串数组中的公共最长前缀
要点:
一、2个字符串中间的公共前缀,肯定在长度短的字符串中
二、不断地比较过程中,公共最长前缀只会越来越短
三、故先假定第一个为答案,然后不断地比较下去
string longestCommonPrefix(vector<string>& strs) {string ans;int n,i,j,len;n=strs.size();if(n==0)return "";ans=strs[0];for(i=1;i<n;i++){len=ans.length()<strs[i].length()?ans.length():strs[i].length();for(j=0;j<len;j++)if(ans[j]!=strs[i][j])break;ans=ans.substr(0,j);}return ans;}
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