#include <bits/stdc++.h>
using namespace std;
int squares[25000000];
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; ++i)
{
for (int j = i; i * i + j * j < n * n; ++j)
{
++squares[i * i + j * j];
}
}
int count = 0;
for (int i = 1; i <= n; ++i)
{
for (int h = 1; h < i; ++h)
{
count += squares[i * i - h * h];
}
}
cout << count << '\n';
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #include <bits/stdc++.h> using namespace std; int squares[25000000]; int main() { ios_base::sync_with_stdio(false); cin.tie(0); int n; cin >> n; for (int i = 1; i <= n; ++i) { for (int j = i; i * i + j * j < n * n; ++j) { ++squares[i * i + j * j]; } } int count = 0; for (int i = 1; i <= n; ++i) { for (int h = 1; h < i; ++h) { count += squares[i * i - h * h]; } } cout << count << '\n'; } |
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