Codeforces Young Physicist

题目链接：http://codeforces.com/problemset/problem/69/A

题目分析：坐标求和等于0.

import java.util.Scanner;class Nodes {private int x;private int y;private int z;public int getX() {return x;}public void setX(int x) {this.x = x;}public int getY() {return y;}public void setY(int y) {this.y = y;}public int getZ() {return z;}public void setZ(int z) {this.z = z;}public Nodes(int x, int y, int z) {super();this.x = x;this.y = y;this.z = z;}}
public class Young_Physicist {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);int n = scanner.nextInt();Nodes[] Nodess = new Nodes[n];for(int i = 0; i < n; i++) {Nodess[i] = new Nodes(scanner.nextInt(), scanner.nextInt(), scanner.nextInt());}int x = 0;int y = 0;int z = 0;for(int i = 0; i < n; i++) {x += Nodess[i].getX();y += Nodess[i].getY();z += Nodess[i].getZ();}if(x == 0 && y == 0 && z == 0) System.out.println("YES");else System.out.println("NO");}
}

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