Journey

题意翻译

给出一个$n$个点$m$条边的有向无环图。 问从$1$到$n$，在距离不超过$k$的情况下最多经过多少点，并输出一个方案。

题目描述

Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are $ n $ showplaces in the city, numbered from $ 1 $ to $ n $ , and some of them are connected by one-directional roads. The roads in Berlatov are designed in a way such that there are no cyclic routes between showplaces. Initially Irina stands at the showplace $ 1 $ , and the endpoint of her journey is the showplace $ n $ . Naturally, Irina wants to visit as much showplaces as she can during her journey. However, Irina's stay in Berlatov is limited and she can't be there for more than $ T $ time units. Help Irina determine how many showplaces she may visit during her journey from showplace $ 1 $ to showplace $ n $ within a time not exceeding $ T $ . It is guaranteed that there is at least one route from showplace $ 1 $ to showplace $ n $ such that Irina will spend no more than $ T $ time units passing it.

输入输出格式

输入格式

The first line of the input contains three integers $ n,m $ and $ T $ ( $ 2<=n<=5000,1<=m<=5000,1<=T<=10^{9} $ ) — the number of showplaces, the number of roads between them and the time of Irina's stay in Berlatov respectively. The next $ m $ lines describes roads in Berlatov. $ i $ -th of them contains $ 3 $ integers $ u_{i},v_{i},t_{i} $ ( $ 1<=u_{i},v_{i}<=n,u_{i}≠v_{i},1<=t_{i}<=10^{9} $ ), meaning that there is a road starting from showplace $ u_{i} $ and leading to showplace $ v_{i} $ , and Irina spends $ t_{i} $ time units to pass it. It is guaranteed that the roads do not form cyclic routes. It is guaranteed, that there is at most one road between each pair of showplaces.

输出格式

Print the single integer $ k $ ( $ 2<=k<=n $ ) — the maximum number of showplaces that Irina can visit during her journey from showplace $ 1 $ to showplace $ n $ within time not exceeding $ T $ , in the first line. Print $ k $ distinct integers in the second line — indices of showplaces that Irina will visit on her route, in the order of encountering them. If there are multiple answers, print any of them.

输入输出样例

输入样例 #1

4 3 13
1 2 5
2 3 7
2 4 8

输出样例 #1

3
1 2 4 

输入样例 #2

6 6 7
1 2 2
1 3 3
3 6 3
2 4 2
4 6 2
6 5 1

输出样例 #2

4
1 2 4 6 

输入样例 #3

5 5 6
1 3 3
3 5 3
1 2 2
2 4 3
4 5 2

输出样例 #3

3
1 3 5