#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <unordered_map>
#include <unordered_set>
#include <queue>
#include <deque>
#include <tuple>
#include <bitset>
using namespace std;
#define pb push_back
#define mp make_pair
#define st first
#define nd second
#define x first
#define y second
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
int S[25000000];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
int ans = 0;
for(int c=1; c<=n; c++){
for(int d=1; d<=n; d++){
int C = c*c;
int D = d*d;
if(D>=C){
S[D-C]++;
// cout << d << " " << c << " " << D-C << "\n";
}
}
}
// cout << "--------------------------\n";
for(int a=1; a<=n; a++){
for(int b=a; b<=n; b++){
int A = a*a;
int B = b*b;
if(A+B<25000000 && S[A+B]){
ans+=S[A+B];
// cout << a << " " << b << " " << A+B << " " << S[A+B] << "\n";
}
}
}
cout << ans << "\n";
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 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | #include <iostream> #include <vector> #include <set> #include <map> #include <algorithm> #include <unordered_map> #include <unordered_set> #include <queue> #include <deque> #include <tuple> #include <bitset> using namespace std; #define pb push_back #define mp make_pair #define st first #define nd second #define x first #define y second typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef vector<int> vi; typedef vector<ll> vll; int S[25000000]; int main(){ ios_base::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; int ans = 0; for(int c=1; c<=n; c++){ for(int d=1; d<=n; d++){ int C = c*c; int D = d*d; if(D>=C){ S[D-C]++; // cout << d << " " << c << " " << D-C << "\n"; } } } // cout << "--------------------------\n"; for(int a=1; a<=n; a++){ for(int b=a; b<=n; b++){ int A = a*a; int B = b*b; if(A+B<25000000 && S[A+B]){ ans+=S[A+B]; // cout << a << " " << b << " " << A+B << " " << S[A+B] << "\n"; } } } cout << ans << "\n"; return 0; } |
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