結果
| 問題 |
No.117 組み合わせの数
|
| ユーザー |
tancahn2380
|
| 提出日時 | 2017-09-24 16:08:20 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 2,287 ms / 5,000 ms |
| コード長 | 1,987 bytes |
| コンパイル時間 | 670 ms |
| コンパイル使用メモリ | 86,804 KB |
| 実行使用メモリ | 394,012 KB |
| 最終ジャッジ日時 | 2024-11-14 07:10:35 |
| 合計ジャッジ時間 | 5,796 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| other | AC * 1 |
ソースコード
# include <iostream>
# include <algorithm>
# include <vector>
# include <string>
# include <set>
# include <map>
# include <cmath>
# include <iomanip>
# include <functional>
# include <utility>
# include <stack>
# include <queue>
# include <list>
# include <bitset>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
constexpr long long MOD = 1000000000 + 7;
constexpr long long INF = 100000000;
const double PI = acos(-1);
//組み合わせ(コンビネーション)
int fact[100000000];
LL factrial(LL n, LL mod) {
if (fact[n] != 0)return fact[n];
if (n == 0)return fact[n] = 1;
return fact[n] = factrial(n - 1, mod)*n%mod;
}
void factrialinitialize(LL n, LL mod) {
fact[0] = 1;
for (LL i = 1; i < n; i++) {
fact[i] = i * fact[i - 1] % mod;
}
}
LL repeatsquaring(LL n, LL p, LL mod) {
if (n == 0)return 0;
if (p <= 0 || n == 1)return 1;
if (p % 2 == 0) {
LL t = repeatsquaring(n, p / 2, mod);
return t*t%mod;
}
return n*repeatsquaring(n, p - 1, mod) % mod;
}
LL permutation(LL n, LL r, LL mod) {
if (n < r)return 0;
if (n == r)return factrial(n, mod);
LL ans = 1;
ans *= factrial(n, mod);
ans %= mod;
ans *= repeatsquaring(factrial(n - r, mod), mod - 2, mod);
ans %= mod;
return ans;
}
LL combination(LL n, LL r, LL mod) {
if (r == 0) return 1;
if (n < r)return 0;
LL ans = 1;
ans *= factrial(n, mod);
ans %= mod;
ans *= repeatsquaring(factrial(n - r, mod), mod - 2, mod);
ans %= mod;
ans *= repeatsquaring(factrial(r, mod), mod - 2, mod);
ans %= mod;
return ans;
}
LL CombinationWithRepetition(LL n, LL r, LL mod) {
return combination(n + r - 1, r, mod);
}
int main() {
factrialinitialize(100000000, MOD);
//(n,r,MOD)
int n;
cin >> n;
int a, b;
char c, d;
for (int i = 0; i < n; i++) {
cin >> c >> d >> a >> d >> b >> d;
if (c == 'C')cout << combination(a, b, MOD) << endl;
if (c == 'P')cout << permutation(a, b, MOD) << endl;
if (c == 'H')cout << CombinationWithRepetition(a, b, MOD) << endl;
}
}
tancahn2380