AtCoder Beginner Contest 061 D - Score Attack(最短路变形，Bellman-Ford最短路算法)

D - Score Attack

---

Time limit : 2sec / Memory limit : 256MB

Score : 400 points

Problem Statement

There is a directed graph with N vertices and M edges. The i-th edge (1≤i≤M) points from vertex ai to vertex bi, and has a weight ci. We will play the following single-player game using this graph and a piece.

Initially, the piece is placed at vertex 1, and the score of the player is set to 0. The player can move the piece as follows:

• When the piece is placed at vertex ai, move the piece along the i-th edge to vertex bi. After this move, the score of the player is increased by ci.

The player