139. 单词拆分

/**
 * @param {string} s
 * @param {string[]} wordDict
 * @return {boolean}
 */
var wordBreak = function (s, wordDict) {
  let dp = Array(s.length + 1).fill(false)
  dp[0] = true

  for (let i = 0; i <= s.length; i++) {
    for (let j = 0; j < wordDict.length; j++) {
      if (i >= wordDict[j].length) {
        if (s.slice(i - wordDict[j].length, i) === wordDict[j] && dp[i - wordDict[j].length]) {
          dp[i] = true
        }
      }
    }
  }

  return dp[s.length]
}