結果
| 問題 |
No.117 組み合わせの数
|
| ユーザー |
|
| 提出日時 | 2019-04-29 14:00:32 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 206 ms / 5,000 ms |
| コード長 | 2,329 bytes |
| コンパイル時間 | 1,699 ms |
| コンパイル使用メモリ | 169,996 KB |
| 実行使用メモリ | 34,560 KB |
| 最終ジャッジ日時 | 2024-12-24 08:00:06 |
| 合計ジャッジ時間 | 2,527 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 1 |
コンパイルメッセージ
In function 'long long int h(long long int, long long int)',
inlined from 'int main(int, const char**)' at main.cpp:102:24:
main.cpp:69:13: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized]
69 | if(n == 0 && k == 0)return 1;
| ~~~~~~~^~~~~~~~~
main.cpp: In function 'int main(int, const char**)':
main.cpp:91:11: note: 'k' was declared here
91 | ll n, k;
| ^
In function 'long long int h(long long int, long long int)',
inlined from 'int main(int, const char**)' at main.cpp:102:24:
main.cpp:69:13: warning: 'n' may be used uninitialized [-Wmaybe-uninitialized]
69 | if(n == 0 && k == 0)return 1;
| ~~~~~~~^~~~~~~~~
main.cpp: In function 'int main(int, const char**)':
main.cpp:91:8: note: 'n' was declared here
91 | ll n, k;
| ^
ソースコード
// includes
#include <bits/stdc++.h>
// macros
#define ll long long int
#define pb emplace_back
#define mk make_pair
#define pq priority_queue
#define FOR(i, a, b) for(int i=(a);i<(b);++i)
#define rep(i, n) FOR(i, 0, n)
#define rrep(i, n) for(int i=((int)(n)-1);i>=0;i--)
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define UNIQUE(v) v.erase(unique(v.begin(), v.end()), v.end())
#define FI first
#define SE second
using namespace std;
// types
typedef pair<int, int> P;
typedef pair<ll, int> Pl;
typedef pair<ll, ll> Pll;
typedef pair<double, double> Pd;
// constants
const int inf = 1e9;
const ll linf = 1LL << 50;
const double EPS = 1e-10;
const int mod = 1e9 + 7;
// solve
template <class T>bool chmax(T &a, const T &b){if(a < b){a = b; return 1;} return 0;}
template <class T>bool chmin(T &a, const T &b){if(a > b){a = b; return 1;} return 0;}
template <typename T> istream &operator>>(istream &is, vector<T> &vec){for(auto &v: vec)is >> v; return is;}
template <typename T>
T power(T a, T n, T mod) {
T res = 1;
T tmp = n;
T curr = a;
while(tmp){
if(tmp % 2 == 1){
res = (T)((ll)res * curr % mod);
}
curr = (T)((ll)curr * curr % mod);
tmp >>= 1;
}
return res;
}
ll fac[2000001], inv[2000001];
ll comb(ll n, ll k){
if(n < k)return 0;
ll res = fac[n];
res = res * inv[k] % mod;
res = res * inv[n-k] % mod;
return res;
}
ll permu(ll n, ll k){
if(n < k)return 0;
ll res = fac[n];
res = res * inv[n-k] % mod;
return res;
}
ll h(ll n, ll k){
if(n == 0 && k == 0)return 1;
return comb(n + k - 1, k);
}
int main(int argc, char const* argv[])
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int t;
cin >> t;
fac[0] = 1;
FOR(i, 1, 2000001){
fac[i] = i * fac[i-1] % mod;
}
inv[2000000] = power<ll>(fac[2000000], mod - 2, mod);
for(int i = 1999999; i >= 0; i--){
inv[i] = (i + 1) * inv[i+1] % mod;
}
rep(i, t){
string s;
cin >> s;
string t = s.substr(2, sz(s) - 3);
ll n, k;
for(int j = 0; j < sz(t); j++){
if(t[j] == ','){
n = stol(t.substr(0, j));
k = stol(t.substr(j+1, sz(t) - j - 1));
break;
}
}
if(s[0] == 'C')cout << comb(n, k) << endl;
else if(s[0] == 'P')cout << permu(n, k) << endl;
else cout << h(n, k) << endl;
}
return 0;
}