Codeforeces——69A Young Physicist

题干

time limit per test：2 seconds
memory limit per test：256 megabytes
input：standard input
output：standard output

A guy named Vasya attends the final grade of a high school. One day Vasya decided to watch a match of his favorite hockey team. And, as the boy loves hockey very much, even more than physics, he forgot to do the homework. Specifically, he forgot to complete his physics tasks. Next day the teacher got very angry at Vasya and decided to teach him a lesson. He gave the lazy student a seemingly easy task: You are given an idle body in space and the forces that affect it. The body can be considered as a material point with coordinates (0; 0; 0). Vasya had only to answer whether it is in equilibrium. “Piece of cake” — thought Vasya, we need only to check if the sum of all vectors is equal to 0. So, Vasya began to solve the problem. But later it turned out that there can be lots and lots of these forces, and Vasya can not cope without your help. Help him. Write a program that determines whether a body is idle or is moving by the given vectors of forces.

Input

The first line contains a positive integer n (1 ≤ n ≤ 100), then follow n lines containing three integers each: the xi coordinate, the yi coordinate and the zi coordinate of the force vector, applied to the body ( - 100 ≤ xi, yi, zi ≤ 100).

Output

Print the word “YES” if the body is in equilibrium, or the word “NO” if it is not.

Examples

Input

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

Output

Input

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

Output

YES

分析

分别统计三列和是否为0，足够水了

代码

#include<iostream>
using namespace std;int main()
{int x = 0,y = 0,z = 0,a,b,c,n;cin >> n;while(n--){cin >> a >> b >> c;x += a;y += b;z += c;}if(x == 0 && y == 0 && z == 0)cout << "YES";elsecout << "NO";return 0;
}

Codeforeces——69A Young Physicist相关推荐

69A.Young Physicist
69A.Young Physicist 题目翻译题目输入输出分析代码题目翻译题目有一位名叫Vasya高三生.一天Vasya打算看他最喜欢的曲棍球队的比赛.然而,相对物理而言他太爱曲 ...
codeforces 69A. Young Physicist
A. Young Physicist 题目链接: codeforces 69A 题意: 输入n个三维点,判断是否平衡,x轴坐标相加等于0 且 y轴坐标相加等于0 且 z轴坐标相加等于 0即为平衡 ...
Codeforces Problem-69A Young Physicist
Codeforces Problem-69A Young Physicist 基本思想: 建立vector容器,一个容器代表一列,分别用v1,v2,v3表示.将输入的数据分别存入到三个容器中,判断最后 ...
codeforces 69A（Young Physicist） Java
水题,提神专用!!! import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; ...
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 Node ...
codeforces水题100道第九题 Codeforces Beta Round #63 (Div. 2) Young Physicist (math)
题目链接:http://www.codeforces.com/problemset/problem/69/A 题意:给你n个三维空间矢量,求这n个矢量的矢量和是否为零. C++代码: #include ...
Codeforces上通过数超过5W人的题
Codeforces上通过数超过5W人的题共32题:1000分4题,800分28题. 编号题号题名分数通过数 1 4A Watermelon 800 x193501 2 71A Way To ...
【Codeforces】A2组刷题记录（50 / 50）完结
目录 A1. Counterexample A2. Good Number A3. Dice Tower ★A4. Alyona and Numbers A5. Mountain Scenery rz ...
算法：详解布隆过滤器的原理、使用场景和注意事项@知乎.Young Chen
算法:详解布隆过滤器的原理.使用场景和注意事项@知乎.Young Chen 什么是布隆过滤器本质上布隆过滤器是一种数据结构,比较巧妙的概率型数据结构(probabilistic data struc ...

Codeforeces——69A Young Physicist

题干

分析

代码

Codeforeces——69A Young Physicist相关推荐

最新文章

热门文章