image.png解:

思路：遍历dictionary ，再使用双指针，挨个比较成员和s。然后将长度最长的存储下来

  1.  let s = "abce", dictionary = ["abe", "abc"]
  2.  var findLongestWord = function (s, dictionary) {
  3.    let res = ''
  4.    dictionary.forEach(val => {
  5.      let len = s.length - 1, len1 = val.length - 1
  6.      while (len >= 0) {
  7.        if (s[len] === val[len1]) {
  8.          len1--;
  9.          len--;
  10.        } else {
  11.          len--
  12.        }
  13.      }
  14.      if (len1 === -1) {
  15.        if ((res.length < val.length || (val.length === res.length && val < res))) {
  16.          res = val
  17.        }
  19.      }
  20.    })
  22.    return res
  23.  };
  24. console.log(findLongestWord(s, dictionary));