leetcode Longest Common Prefix
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求最长公共前缀
要找到两个变量,字符串数组的长度,最短字符串的长度。
public class Solution { public String longestCommonPrefix(String[] strs) { if(strs==null)return null; if(strs.length==0)return ""; int len=strs.length; int minlen=strs[0].length(); for(String str:strs){ if(str.length()<minlen) minlen=str.length(); } int i; for(i=0;i<minlen;i++){ boolean flag=true; for(int j=1;j<len;j++){ if(strs[j].charAt(i)!=strs[0].charAt(i)){ flag=false; } } if(flag==false){ break; } } return strs[0].substring(0,i); }}
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