CF1725M.Moving Both Hands

普及/提高-

通过率:0%

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题目描述

Pak Chanek is playing one of his favourite board games. In the game, there is a directed graph with NN vertices and MM edges. In the graph, edge ii connects two different vertices UiU_i and ViV_i with a length of WiW_i . By using the ii -th edge, something can move from UiU_i to ViV_i , but not from ViV_i to UiU_i .

To play this game, initially Pak Chanek must place both of his hands onto two different vertices. In one move, he can move one of his hands to another vertex using an edge. To move a hand from vertex UiU_i to vertex ViV_i , Pak Chanek needs a time of WiW_i seconds. Note that Pak Chanek can only move one hand at a time. This game ends when both of Pak Chanek's hands are on the same vertex.

Pak Chanek has several questions. For each pp satisfying 2pN2 \leq p \leq N , you need to find the minimum time in seconds needed for Pak Chanek to end the game if initially Pak Chanek's left hand and right hand are placed on vertex 11 and vertex pp , or report if it is impossible.

输入格式

The first line contains two integers NN and MM ( 2N1052 \leq N \leq 10^5 , 0M21050 \leq M \leq 2 \cdot 10^5 ) — the number of vertices and edges in the graph.

The ii -th of the next MM lines contains three integers UiU_i , ViV_i , and WiW_i ( 1Ui,ViN1 \le U_i, V_i \le N , UiViU_i \neq V_i , 1Wi1091 \le W_i \le 10^9 ) — a directed edge that connects two different vertices UiU_i and ViV_i with a length of WiW_i . There is no pair of different edges ii and jj such that Ui=UjU_i = U_j and Vi=VjV_i = V_j .

输出格式

Output a line containing N1N-1 integers. The jj -th integer represents the minimum time in seconds needed by Pak Chanek to end the game if initially Pak Chanek's left hand and right hand are placed on vertex 11 and vertex j+1j+1 , or 1-1 if it is impossible.

输入输出样例

  • 输入#1

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

    输出#1

    1 -1 3 4

说明/提示

If initially Pak Chanek's left hand is on vertex 11 and his right hand is on vertex 55 , Pak Chanek can do the following moves:

  1. Move his right hand to vertex 44 in 11 second.
  2. Move his left hand to vertex 22 in 22 seconds.
  3. Move his left hand to vertex 44 in 11 second.

In total it needs 1+2+1=41+2+1=4 seconds. It can be proven that there is no other way that is faster.

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