結果

問題 No.117 組み合わせの数
ユーザー Bantako
提出日時 2018-06-04 11:32:44
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 988 bytes
コンパイル時間 1,595 ms
コンパイル使用メモリ 170,068 KB
実行使用メモリ 18,976 KB
最終ジャッジ日時 2024-06-30 09:33:48
合計ジャッジ時間 2,550 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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ファイルパターン 結果
other WA * 1
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コンパイルメッセージ
main.cpp:28:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   28 | main(){
      | ^~~~
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/istream:39,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/sstream:38,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/complex:45,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ccomplex:39,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/x86_64-pc-linux-gnu/bits/stdc++.h:54,
                 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:42:17:
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ostream:202:25: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
  202 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function 'int main()':
main.cpp:38:12: note: 'ans' was declared here
   38 |         ll ans;
      |            ^~~

ソースコード

diff # 

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
vector<ll> fact(2000010);
ll powmod(ll x,ll n){
    if(n == 0)return 1;
    ll ans = powmod(x*x%MOD,n/2);
    if(n % 2)ans = ans * x % MOD;
    return ans;
}
ll divmod(ll a,ll b){
    return ((a%MOD) * (powmod(b,MOD-2)%MOD)) % MOD;
}
ll perm(ll n,ll r){
    if(n < r)return 0;
    return divmod( fact[n] , fact[n-r]);
}
ll combi(ll n,ll r){
    if(n < r || n < 0)return 0;
    return divmod( perm(n,r) , fact[r]);
}
ll dupc(ll n,ll r){
    return combi(n+r-1,r);
}
main(){
    fact[0] = 1;
    rep(i,1,2000010)fact[i] = fact[i-1] * i % MOD;

    ll T;
    scanf("%lld",&T);
    rep(i,0,T){
        char c;
        int a,b;
        scanf(" %c(%d,%d)",&c ,&a ,&b);
        ll ans;
        if(c == 'P')ans = perm(a,b);
        if(c == 'C')ans = combi(a,b);
        if(c == 'H')ans = dupc(a,b);
        cout << ans << endl;
    }
}
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