public static String longestCommonPrefix(String[] strs) {
if (strs==null|| 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);
}
}
return prefix;
}
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