#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll N=5001, br=0, ans, n;
vector<ll> kwadr, odp(N+3);
vector<int> sumkw(N*N+999);
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n;
for (int i=1; i<=N; i++){
kwadr.push_back(i*i);
}
for (int i=0; i<kwadr.size(); i++){
for (int j=i; j<kwadr.size(); j++){
ll z=kwadr[i]+kwadr[j];
if (z>N*N) break;
sumkw[z]++;
}
}
for (int i=0; i<sumkw.size(); i++){
if (sumkw[i]) br++;
}
for (int P=1; P<=N; P++){
for (ll h=1; h<=N; h++){
ll brak=(P*P)-(h*h);
if (brak<=0 || brak>=sumkw.size()) continue;
odp[P]+=sumkw[brak];
}
}
for (int i=1; i<=n; i++){
ans+=odp[i];
}
cout << 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 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #include <bits/stdc++.h> using namespace std; #define ll long long ll N=5001, br=0, ans, n; vector<ll> kwadr, odp(N+3); vector<int> sumkw(N*N+999); int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cin >> n; for (int i=1; i<=N; i++){ kwadr.push_back(i*i); } for (int i=0; i<kwadr.size(); i++){ for (int j=i; j<kwadr.size(); j++){ ll z=kwadr[i]+kwadr[j]; if (z>N*N) break; sumkw[z]++; } } for (int i=0; i<sumkw.size(); i++){ if (sumkw[i]) br++; } for (int P=1; P<=N; P++){ for (ll h=1; h<=N; h++){ ll brak=(P*P)-(h*h); if (brak<=0 || brak>=sumkw.size()) continue; odp[P]+=sumkw[brak]; } } for (int i=1; i<=n; i++){ ans+=odp[i]; } cout << ans; return 0; } |
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