Problem:
Write a function to find the longest common prefix string amongst an array of strings.
Solution:
Idea: compare each character of all the strings.
Code:
public class Solution {
public String longestCommonPrefix(String[] strs) {
StringBuilder sb = new StringBuilder();
if (strs == null || strs.length == 0) return "";
for (int i = 0; i < strs[0].length(); i++) {
for (int j = 1; j < strs.length; j++) {
if (i >= strs[j].length()) return sb.toString();
if (strs[j].charAt(i) != strs[0].charAt(i)) return sb.toString();
}
sb.append(strs[0].charAt(i));
}
return sb.toString();
}
}