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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int f(int , int);
int main()
{
    int n,a;
    scanf("%d %d",&n,&a);
    printf("%d\n",f(n,a));
    return 0;
}
int f(int n, int a)
{
    int x = n*n - a;
    if(x<=0)
    {
        return 0;
    }
    else
    {
        return x;
    }
}