14. Longest Common Prefix

Java

public class Solution {
public String longestCommonPrefix(String[] strs) {
if(strs.length==0) return "";
int count=0; boolean search=true;
while(search){
if(strs[0].length()<=count) break;
for(int i=1; i<strs.length; i++){
if(strs[i].length()<=count||strs[i].charAt(count)!=strs[i-1].charAt(count)) {search=false; count--; break;}
}
count++;
}
return strs[0].substring(0,count);
}
}
Python

class Solution(object):
def longestCommonPrefix(self, strs):
"""
:type strs: List[str]
:rtype: str
"""
if len(strs)==0:
return ""
minLen=sys.maxint
maxPre=""
for i in range(len(strs)):
minLen=min(minLen,len(strs[i]))
for i in range(minLen):
for j in range(len(strs)-1):
if strs[j][i]!=strs[j+1][i]:
return maxPre
maxPre+=strs[0][i]
return maxPre