14 - Longest Common Prefix

 JAVA

• class Solution {
      public String longestCommonPrefix(String[] strs) {
          int n = strs.length;
          for (int i = 0; i < strs[0].length(); ++i) {
              for (int j = 1; j < n; ++j) {
                  if (strs[j].length() <= i || strs[j].charAt(i) != strs[0].charAt(i)) {
                      return strs[0].substring(0, i);
                  }
              }
          }
          return strs[0];
      }
  }
  

C++

• class Solution {
  public:
      string longestCommonPrefix(vector<string>& strs) {
          int n = strs.size();
          for (int i = 0; i < strs[0].size(); ++i) {
              for (int j = 1; j < n; ++j) {
                  if (strs[j].size() <= i || strs[j][i] != strs[0][i]) {
                      return strs[0].substr(0, i);
                  }
              }
          }
          return strs[0];
      }
  };