#include <bits/stdc++.h> #define all(x) (x).begin(),(x).end() using namespace std; using ll = long long; using ld = long double; //#define int ll #define sz(x) ((int)(x).size()) using pii = pair<int,int>; using tii = tuple<int,int,int>; const int nmax = 5e3 + 5; int freq[nmax * nmax]; signed main() { cin.tie(0) -> sync_with_stdio(0); int n; cin >> n; for(int a = 1; a <= n; a++) { for(int b = a; a * a + b * b <= n * n; b++) { freq[a * a + b * b]++; } } ll rez = 0; for(int d = 1; d <= n; d++) { for(int c = 1; d * d - c * c > 0; c++) { rez += freq[d * d - c * c]; } } cout << rez << '\n'; } /** Binecuvanteaza Doamne Ukraina. -- */
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 35 36 37 38 39 40 | #include <bits/stdc++.h> #define all(x) (x).begin(),(x).end() using namespace std; using ll = long long; using ld = long double; //#define int ll #define sz(x) ((int)(x).size()) using pii = pair<int,int>; using tii = tuple<int,int,int>; const int nmax = 5e3 + 5; int freq[nmax * nmax]; signed main() { cin.tie(0) -> sync_with_stdio(0); int n; cin >> n; for(int a = 1; a <= n; a++) { for(int b = a; a * a + b * b <= n * n; b++) { freq[a * a + b * b]++; } } ll rez = 0; for(int d = 1; d <= n; d++) { for(int c = 1; d * d - c * c > 0; c++) { rez += freq[d * d - c * c]; } } cout << rez << '\n'; } /** Binecuvanteaza Doamne Ukraina. -- */ |