Longest Common Prefix
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Write a function to find the longest common prefix string amongst an array of strings.
总之不难,但是脑袋要清醒..
代码:
public class Solution { public String longestCommonPrefix(String[] strs) { String res =""; if(strs.length == 0){ return ""; } if(strs.length ==1){ return strs[0]; } int p1 =0,p2 = strs.length-1;//控制在线性时间,好像是不可能的。。 int len = strs[0].length()>strs[1].length()?strs[1].length():strs[0].length(); for(int i=0;i<len;i++){ if(strs[0].charAt(i) == strs[1].charAt(i)){ res += strs[0].charAt(i); }else break; }// System.out.println(res); //已经找到了一个公共子序列,判断会不会变得更短 for(int i = 2;i<strs.length;i++){ int len2 = res.length()>strs[i].length()?strs[i].length():res.length(); System.out.println("len2 :"+len2);if(len2 == 0){return "";}//如果已有的字符比要比较的字符长,截取if(len2 < res.length()){res = res.substring(0, len2);} for(int j=0;j<len2;j++){ if(res.charAt(j)!=strs[i].charAt(j)){ if(j==0){ return ""; } res = res.substring(0, j); break; } } } return res; }}
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