I got 100/100 point.

My Solution: we need calculate how many pair (a, b) with: a^2 - b^2 <= n

=> (a - b)(a + b) <= n

Let: a = b + k (with b > 0; k> 0; and k is even, means: k % 2 == 0)

=> k(2b + k) <= n

=> b <= (n/k - k)/2

The result is sum of all b.

We need 1 FOR-loop: from 1 to sqrt(n):

long caculate(n, k) {
	return (long) ((double) n / k - k) / 2;
}
// Main:
sum = 0;
for (int k = 2; k < sqrt(n); k += 2) {
   b = calculate(n, k);
   if (b > 0) 
   	sum += b;   
}
return sum;

n,k,b.. is Long, not Integer!

GOOD LUCK!!

simple c++ solution::

#include<bits/stdc++.h>
using namespace std;

int main() 
{
    long n;
    cin>>n;
    long long tiles=n/4;
    long long  k=int(sqrt(tiles));
    long long sum=0;
    for(int i=1;i<=k;i++)
    {
        sum=sum+(tiles/i-i);
        
    }
    cout<<sum;
    return 0;
}

I was able to make it working using the below algorithm.

private static long findNums(long totalTiles){
    int maxLvel = (int)Math.sqrt(totalTiles-1)/2;
    long count = 0;
    for(int i = 1;i<=maxLvel;i++){
        //Finds number of laminates of the same level. For a a given hole size h and a level l (2*(l+h/2))^2 <= tiles + h^2
        count += (long) ((totalTiles/(4*i))-i);
    }

    return count;
}

Is there no way to find out the input of each test case?

PLEASE IF SOMEONE COULD HELP ME WITH THE BELOW CODE::: double d=Math.sqrt((double)n); int y=(int)d; for(int g=(int)d;g>=3;g--) { int p=g*g; if(g%2==0) { int v=2; int fl=v*v; while(fl