Interview Question for Graduate Software Engineer at Google:

static int minWin = Integer.MAX_VALUE;

   public static int minWindow(char[] str, char[] chars, int startIndx, int i, int j) {
      if (j == chars.length) {
         // found the solution
         // check the minimum
         if ((i - startIndx) < minWin)
            minWin = i - startIndx;
         return minWin;
      } else {
         for (int k = i; k < str.length; k++) {
            if (str[k] == chars[j]) {
               if (j == 0){
                  startIndx = k;
               }
               minWindow(str, chars, startIndx, ++k, ++j);
            }
         }
      }
      if (minWin > 0) {
         return minWin;
      }
      return -1;
   }