#include <bits/stdc++.h>
using namespace std;
int main()
{
unordered_map<int, int> sq;
int n;
long long counter = 0;
cin >> n;
for (int i = 1; i <= n; i++)
{
sq[i*i] = i;
}
for (n; n > 0; n--)
{
int nsq = n*n;
for (int i = 1; i < n; i++)
{
for (int j = 1; j <= i; j++)
{
int zsq = nsq - i*i - j*j;
if (sq.contains(zsq))
{
counter++;
}
}
}
}
cout << counter << 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 | #include <bits/stdc++.h> using namespace std; int main() { unordered_map<int, int> sq; int n; long long counter = 0; cin >> n; for (int i = 1; i <= n; i++) { sq[i*i] = i; } for (n; n > 0; n--) { int nsq = n*n; for (int i = 1; i < n; i++) { for (int j = 1; j <= i; j++) { int zsq = nsq - i*i - j*j; if (sq.contains(zsq)) { counter++; } } } } cout << counter << endl; return 0; } |
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