Jishan's Log 14: Codeforces 69A solution

Codeforces 69A: Young Physicist

The Problem:

A boy is given a boy with a set of forces acting on it in x, y and z space. He needs to find out if the body is in equilibrium or not.

For a body to be in equilibrium, all forces on it must be balanced ( Σ(F) == 0 ). So, we need to find out if the forces in x, y, z plane individually are 0.

The Solution:

The Algorithm:

1) Take n input. Declare sums of x, y, z and set them to 0.

2) Take a loop and make it run n times.

3) Take the x, y, z inputs and sum them up with their respective sum variables.

4) Check to see if all of them are zero. If true, print YES. Else print NO

The Code:

#include<bits/stdc++.h>

#define fastio ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

int main()

{

    fastio;

    int n; cin >> n;

    int x_sum, y_sum, z_sum;

    x_sum = y_sum = z_sum = 0;

    while (n--)

    {

        int x, y, z; cin >> x >> y >> z;

        x_sum += x;

        y_sum += y;

        z_sum += z;

    }

    if(x_sum == 0 && y_sum == 0 && z_sum == 0) cout << "YES\n";

    else cout << "NO\n";

    

}