// Author: Bartek Knapik
#include <cstdio>
int cnt[5000*5000+9];
int n, ans;
int main()
{
scanf("%d", &n);
for (int a = 1; a <= n; ++a)
for (int b = a; a*a + b*b <= n*n; ++b)
cnt[a*a + b*b]++;
for (int d = 1; d <= n; ++d)
for (int h = d - 1; h > 0; --h)
ans += cnt[d*d - h*h];
printf("%d\n", ans);
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | // Author: Bartek Knapik #include <cstdio> int cnt[5000*5000+9]; int n, ans; int main() { scanf("%d", &n); for (int a = 1; a <= n; ++a) for (int b = a; a*a + b*b <= n*n; ++b) cnt[a*a + b*b]++; for (int d = 1; d <= n; ++d) for (int h = d - 1; h > 0; --h) ans += cnt[d*d - h*h]; printf("%d\n", ans); return 0; } |
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