014 - Longest Common Prefix

14. Longest Common Prefix

Problem Statement

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".

 

Example 1:

Input: strs = ["flower","flow","flight"]
Output: "fl"

Example 2:

Input: strs = ["dog","racecar","car"]
Output: ""
Explanation: There is no common prefix among the input strings.

 

Constraints:

• 1 <= strs.length <= 200
• 0 <= strs[i].length <= 200
• strs[i] consists of only lowercase English letters.

Solutions

Java

class Solution {

  public String longestCommonPrefix(String[] strs) {
    String res = strs[0];

    for (int i = 1; i < strs.length; i++)
      while (!strs[i].startsWith(res))
        res = res.substring(0, res.length() - 1);

    return res;
  }
}

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