class Solution {
public String longestCommonPrefix(String[] strs) {
if(strs.length==0){
return " ";
}
String prefix = strs[0];
for(int i=1;i<strs.length;i++){
while(strs[i].indexOf(prefix)!=0){
prefix=prefix.substring(0,prefix.length()-1);
if (prefix.isEmpty()) {
return "";
}
}
}
}
return prefix;
}
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