http://poj.org/problem?id=2377 //* @author: <strong>Yeming Hu</strong>"cslittleye@gmail.com" import java.util.*; import java.io.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(new BufferedInputStream(System.in)); int n = sc.nextInt(); int m = sc.nextInt(); int[] mind = new int[n]; boolean[] reached = new boolean[n]; int[][] dist = new int[n][n]; for(int i = 0; i < n; i++) { mind[i] = 0; reached[i] = false; for(int j = 0; j < n; j++) { dist[i][j] = 0; } } for(int i = 0; i < m; i++) { int a = sc.nextInt(); int b = sc.nextInt(); int c = sc.nextInt(); if(dist[a-1][b-1] < c) { dist[a-1][b-1] = c; dist[b-1][a-1] = c; } } boolean isPossible = true; int total = 0; reached[0] = true; for(int j = 0; j < n; j++) { if(!reached[j] && dist[j][0] > mind[j]) { mind[j] = dist[j][0]; } } for(int i = 1; i < n; i++) { int max = 0; int index = -1; for(int j = 0; j < n; j++) { if(!reached[j] && mind[j] > max) { max = mind[j]; index = j; } } if(index == -1) { isPossible = false; break; } reached[index] = true; total += mind[index]; for(int j = 0; j < n; j++) { if(!reached[j] && dist[j][index] > mind[j]) { mind[j] = dist[j][index]; } } } if(isPossible) { System.out.println(total); }else { System.out.println(-1); } } }
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