結果
| 問題 | No.584 赤、緑、青の色塗り | 
| コンテスト | |
| ユーザー |  はまやんはまやん | 
| 提出日時 | 2017-10-28 02:44:23 | 
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 19 ms / 2,000 ms | 
| コード長 | 3,964 bytes | 
| コンパイル時間 | 1,688 ms | 
| コンパイル使用メモリ | 174,812 KB | 
| 実行使用メモリ | 6,820 KB | 
| 最終ジャッジ日時 | 2024-11-22 00:15:26 | 
| 合計ジャッジ時間 | 2,489 ms | 
| ジャッジサーバーID (参考情報) | judge3 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 6 | 
| other | AC * 14 | 
ソースコード
#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
//---------------------------------------------------------------------------------------------------
template<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u); }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
template<typename T, int FAC_MAX> struct Comb { vector<T> fac, ifac;
    Comb() {fac.resize(FAC_MAX, 1); ifac.resize(FAC_MAX, 1);rep(i, 1, FAC_MAX) fac[i] = fac[i - 1] * i;
        rep(i, 1, FAC_MAX) ifac[i] = T(1) / fac[i];}
    T aPb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b]; }
    T aCb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b] * ifac[b]; }
    T nHk(int n, int k) { if (n < 0 || k < 0) return 0; if (n == 0) return T(1);
        return aCb(n + k - 1, k); }
};
typedef ModInt<1000000007> mint;
/*---------------------------------------------------------------------------------------------------
            ∧_∧  
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     
    /   \     | |     
    /   / ̄ ̄ ̄ ̄/  |  
  __(__ニつ/     _/ .| .|____  
     \/____/ (u ⊃  
---------------------------------------------------------------------------------------------------*/
int N, R, G, B;
Comb<mint, 10101> com;
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N >> R >> G >> B;
    mint ans = 0;
    rep(two, 0, N) rep(r, 0, min(R, two) + 1) {
        int one = R + G + B - two * 2;
        int mi = two * 3 - 1 + one * 2;
        if (N < mi or one < 0 or min(G, B) < two - r) continue;
        //printf("%d %d %d\n", one , two, r);
        int rest = N - two * 2 - one - two - one + 1;
        int all = one + two + 1;
        //printf("%d %d\n", rest, all);
        mint place = com.aCb(one + two, two) * com.nHk(all, rest);
        mint color = com.aCb(two, r) * (mint(2) ^ two);
        color *= com.aCb(one, R - r);
        color *= com.aCb(r + one - (R - r), G - (two - r));
        ans += place * color;
    }
    cout << ans << endl;
}
            
            
            
        