#103426 (C++14) No.269 見栄っ張りの募金活動

• 問題: No.269 見栄っ張りの募金活動
• ユーザー: paruki
• 提出日時: 2016-07-14 21:04:29
• 言語: C++14 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 2,137 ms / 5,000 ms
• コード長: 2,516 bytes
• コンパイル時間: 1,624 ms
• コンパイル使用メモリ: 171,624 KB
• 実行使用メモリ: 11,136 KB
• 最終ジャッジ日時: 2024-07-16 01:55:56
• 合計ジャッジ時間: 9,248 ms
• ジャッジサーバーID （参考情報）: judge1 / judge5

ファイルパターン	結果
sample	AC * 3
other	AC * 22

ソースコード

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#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
template<int MOD>
class ModInt{
public:
    ModInt():value(0){}
    ModInt(long long val):value((int)(val<0?MOD+val%MOD:val%MOD)){ }
    ModInt& operator+=(ModInt that){
        value = value+that.value;
        if(value>=MOD)value-=MOD;
        return *this;
    }
    ModInt& operator-=(ModInt that){
        value -= that.value;
        if(value<0)value+=MOD;
        return *this;
    }
    ModInt& operator*=(ModInt that){
        value = (int)((long long)value * that.value % 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 operator^(long long k) const{
        ModInt n = *this, res = 1;
        while(k){
            if(k & 1)res *= n;
            n *= n;
            k >>= 1;
        }
        return res;
    }
    ModInt inverse() const {
        long long a = value, b = MOD, u = 1, v = 0;
        while(b) {
            long long t = a / b;
            a -= t * b;
            swap(a, b);
            u -= t * v;
            swap(u, v);
        }
        return ModInt(u);
    }
    int toi() const{ return value; }
private:
    int value;
};
typedef ModInt<1000000007> mint;
ostream& operator<<(ostream& os, const mint& x){
    os << x.toi();
    return os;
}
int N, S, K;
void solve(){
    vector<vector<mint>> dp(N + 1, vector<mint>(S + 1));
    dp[0][0] = 1;
    rep(i, N)rep(j, S + 1)if(dp[i][j].toi()){
        for(int k = 0;; ++k){
            int nj = j + k + (k + K)*(N - 1 - i);
            if(nj > S)break;
            dp[i + 1][nj] += dp[i][j];
        }
    }
    cout << dp[N][S] << endl;
}
int main(){
    while(cin >> N >> S >> K){
        solve();
    }
}
 
 
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