#include <bits/stdc++.h>
using namespace std;
long long tab[5000*5007];
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
long long n;
cin >> n;
for (long long i = 1; i <= n; i++)
{
long long temp = floor(sqrt(n * n - i * i));
for (long long j = i; j <= temp; j++)
{
tab[i * i + j * j]++;
}
}
long long odp = 0;
for (long long i = 1; i <= n; i++)
{
for (long long j = 1; j < i; j++)
{
if(i * i - j * j <= n * n)
{
odp += tab[i * i - j * j];
}
}
}
cout << odp << endl;
return 0;
}
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 | #include <bits/stdc++.h> using namespace std; long long tab[5000*5007]; int main() { ios::sync_with_stdio(0); cin.tie(0); long long n; cin >> n; for (long long i = 1; i <= n; i++) { long long temp = floor(sqrt(n * n - i * i)); for (long long j = i; j <= temp; j++) { tab[i * i + j * j]++; } } long long odp = 0; for (long long i = 1; i <= n; i++) { for (long long j = 1; j < i; j++) { if(i * i - j * j <= n * n) { odp += tab[i * i - j * j]; } } } cout << odp << endl; return 0; } |
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