#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
long long n, tab[5007], wynik, res = 1;
long long gcd(long long a, long long b) {
long long shift;
if (!a) return b;
if (!b) return a;
shift = __builtin_ctz(a | b);
a >>= __builtin_ctz(a);
do {
b >>= __builtin_ctz(b);
if (a > b) {
unsigned int x = b;
b = a;
a = x;
}
b = b - a;
} while (b != 0);
return a << shift;
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> tab[i];
}
for (int i = 1; i <= n; i++) {
for (int j = i+1; j <= n; j++) {
long long liczba1 = tab[i], liczba2 = tab[j];
wynik += gcd(liczba1, liczba2);
}
}
wynik -= n-1;
for (int i = 2; i <= wynik; i++) {
res *= i;
res %= mod;
}
cout << res << "\n";
}
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 | #include <bits/stdc++.h> using namespace std; const int mod = 1e9 + 7; long long n, tab[5007], wynik, res = 1; long long gcd(long long a, long long b) { long long shift; if (!a) return b; if (!b) return a; shift = __builtin_ctz(a | b); a >>= __builtin_ctz(a); do { b >>= __builtin_ctz(b); if (a > b) { unsigned int x = b; b = a; a = x; } b = b - a; } while (b != 0); return a << shift; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cin >> n; for (int i = 1; i <= n; i++) { cin >> tab[i]; } for (int i = 1; i <= n; i++) { for (int j = i+1; j <= n; j++) { long long liczba1 = tab[i], liczba2 = tab[j]; wynik += gcd(liczba1, liczba2); } } wynik -= n-1; for (int i = 2; i <= wynik; i++) { res *= i; res %= mod; } cout << res << "\n"; } |
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