#include<iostream>
#include<cmath>
using namespace std;
constexpr int MAXN = 5e3+3;
int kwadraty[MAXN];
int bin_search(int left, int right, int x)
{
int mid;
while(left<=right)
{
mid=(left+right)/2;
if(kwadraty[mid]==x)
return mid;
else if(kwadraty[mid]<x)
left=mid+1;
else right = mid-1;
}
return -1;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
for(int i=1; i<MAXN; i++)
kwadraty[i] = i*i;
int res=0;
for(int i=1; i<n; i++)
{
for(int j=i; j<n; j++)
{
for(int k=j; k<n; k++)
{
int a = kwadraty[i], b = kwadraty[j], c = kwadraty[k];
int pom = int(sqrt(a+b+c));
if(pom<=n && pom*pom==a+b+c)
{
if(a==b && b==c)
res++;
else if(a==c || c==b || b==a)
res+=2;
else res+=3;
}
}
}
}
cout << res;
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 | #include<iostream> #include<cmath> using namespace std; constexpr int MAXN = 5e3+3; int kwadraty[MAXN]; int bin_search(int left, int right, int x) { int mid; while(left<=right) { mid=(left+right)/2; if(kwadraty[mid]==x) return mid; else if(kwadraty[mid]<x) left=mid+1; else right = mid-1; } return -1; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); int n; cin >> n; for(int i=1; i<MAXN; i++) kwadraty[i] = i*i; int res=0; for(int i=1; i<n; i++) { for(int j=i; j<n; j++) { for(int k=j; k<n; k++) { int a = kwadraty[i], b = kwadraty[j], c = kwadraty[k]; int pom = int(sqrt(a+b+c)); if(pom<=n && pom*pom==a+b+c) { if(a==b && b==c) res++; else if(a==c || c==b || b==a) res+=2; else res+=3; } } } } cout << res; return 0; } |
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