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// @Title: 所有可能的路径 (All Paths From Source to Target)
// @Author: 15816537946@163.com
// @Date: 2021-08-25 11:32:23
// @Runtime: 8 ms
// @Memory: 6.4 MB
func allPathsSourceTarget(graph [][]int) [][]int {
	ans := make([][]int, 0)
	n := len(graph) - 1

	stk := []int{0}
	var dfs func(int)
	dfs = func(x int) {
		if x == n {
			ans = append(ans, append([]int(nil), stk...))
			return
		}

		for _, y := range graph[x] {
			stk = append(stk, y)
			dfs(y)
			stk = stk[:len(stk)-1]
		}
	}
	dfs(0)
	return ans

}