Problem:
Score : 100 points

Problem Statement

We have an N \times N square grid.

We will paint each square in the grid either black or white.

If we paint exactly A squares white, how many squares will be painted black?

Constraints

1 \leq N \leq 100

0 \leq A \leq N^2

Inputs

Input is given from Standard Input in the following format:

N
A

Outputs

Print the number of squares that will be painted black.

Sample Input 1

3
4

Sample Output 1

5

There are nine squares in a 3 \times 3 square grid.
Four of them will be painted white, so the remaining five squares will be painted black.

Sample Input 2

19
100

Sample Output 2

261

Sample Input 3

10
0

Sample Output 3

100

As zero squares will be painted white, all the squares will be painted black.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include "bits/stdc++.h"

#define _USE_MATH_DEFINES

using namespace std;
using ll = long long;
using P = pair<int, int>;

const ll INF = 999999999;
const ll atcoder = 1000000007;
const int dx[4] = { 1 , 0 , -1 ,0 };
const int dy[4] = { 0 , 1 , 0 , -1 };

int main() {

	int a, b;

	cin >> a >> b;

	cout << a*a - b << endl;

	return 0;
}