Grafico

package lista6;
import java.util.*;
import java.lang.*;
import java.io.*;
public class Sendingemail {


	public static void main(String[] args) {
			Scanner in = new Scanner(System.in);
			int n=in.nextInt();
			List<Aresta>[] vertices = new ArrayList[n]<>;
			int m=in.nextInt();
			for(int i=0; i<m; i++) {
				int vertice1=in.nextInt();
				int vertice2=in.nextInt();
				int pesoAresta=in.nextInt();
				if(vertices[vertice1] == null) {
					vertices[vertice1] = new ArrayList<Vertice>();
				}
				if(vertices[vertice2] == null) {
					vertices[vertice2] = new ArrayList<Vertice>();
				}
				vertices[vertice1].add(new Aresta(vertice2,pesoAresta));
			}




	}


}
class Aresta{
	int a,peso;

	public Aresta(int a,int peso) {
		this.a=a;
		this.peso=peso;
	}
}
class Vertice{
	int pos,cost;

	public Vertice(int pos, int cos) {
		this.pos=pos;
		this.cost=cos;
	}
}