leetcode-go/leetcode/medium/609.find-duplicate-file-in-system.go

func findDuplicate(paths []string) [][]string {
	res := make([][]string, 0)
	m := make(map[string]int)
	idx := 0
	for _, path := range paths {
		strs := strings.Split(path, " ")
		for i := 1; i < len(strs); i++ {
			names := strings.Split(strs[i], "(")
			file := strs[0] + "/" + names[0]
			if v, ok := m[names[1]]; ok {
				res[v] = append(res[v], file)
			} else {
				res = append(res, []string{file})
				m[names[1]] = idx
				idx++
			}
		}
	}
	ans := make([][]string, 0)
	for _, r := range res {
		if 1 < len(r) {
			ans = append(ans, r)
		}
	}
	return ans
}