結果

問題 No.117 組み合わせの数
コンテスト
ユーザー kroton
提出日時 2015-01-03 03:24:22
言語 C++11
(gcc 15.2.0 + boost 1.89.0)
コンパイル:
g++-15 -O2 -lm -std=gnu++11 -Wuninitialized -DONLINE_JUDGE -o a.out _filename_
実行:
./a.out
結果
AC  
実行時間 168 ms / 5,000 ms
コード長 1,198 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 1,187 ms
コンパイル使用メモリ 180,500 KB
実行使用メモリ 50,800 KB
最終ジャッジ日時 2026-03-05 20:41:45
合計ジャッジ時間 1,453 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 1
権限があれば一括ダウンロードができます
コンパイルメッセージ
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/ostream:42,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/istream:43,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/sstream:42,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/complex:50,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/ccomplex:43,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/x86_64-pc-linux-gnu/bits/stdc++.h:133,
                 from main.cpp:1:
In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]',
    inlined from 'int main()' at main.cpp:56:17:
/home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/bits/ostream.h:212:25: warning: 'res' may be used uninitialized [-Wmaybe-uninitialized]
  212 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function 'int main()':
main.cpp:51:12: note: 'res' was declared here
   51 |         ll res;
      |            ^~~

ソースコード

diff #
raw source code 

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll MOD = 1e9 + 7;
const int MAX = 2000100;

ll fact[MAX], inv[MAX], fact_inv[MAX];

inline ll P(int n, int k){
    if(k > n)return 0;
    return fact[n] * fact_inv[n-k] % MOD;
}

inline ll C(int n, int k){
    if(k > n)return 0;
    ll res = fact[n];
    res = (res * fact_inv[k]) % MOD;
    res = (res * fact_inv[n-k]) % MOD;
    return res;
}

inline ll H(int n, int k){
    if(n == 0 && k == 0)return 1;
    return C(n + k - 1, k);
}

int main(){
    fact[0] = 1;
    for(int i=1;i<MAX;i++)fact[i] = fact[i-1] * i % MOD;
    
    inv[1] = 1;
    for(int i=2;i<MAX;i++)inv[i] = inv[MOD % i] * (MOD - MOD / i) % MOD;
    
    fact_inv[0] = 1;
    for(int i=1;i<MAX;i++)fact_inv[i] = fact_inv[i-1] * inv[i] % MOD;
    
    
    int T;
    cin >> T;
    
    while(T--){
        string line;
        cin >> line;
        
        char cmd;
        int N, K;
        
        sscanf(line.c_str(), "%c(%d,%d)", &cmd, &N, &K);
        
        ll res;
        if(cmd == 'P')res = P(N, K);
        if(cmd == 'C')res = C(N, K);
        if(cmd == 'H')res = H(N, K);
        
        cout << res << endl;
    }
    
    return 0;
}
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