package q139

func wordBreak(s string, wordDict []string) bool {
	possible := make([]bool, len(s)+1)
	possible[0] = true

	for l := range possible {
		if !possible[l] {
			continue
		}
		for i := range wordDict {
			newLen := len(wordDict[i]) + l
			if newLen > len(s) {
				continue
			}
			if possible[newLen] {
				continue
			}
			if s[l:newLen] == wordDict[i] {
				possible[newLen] = true
			}
		}
	}

	return possible[len(s)]
}

var _ = wordBreak