結果
問題 | No.269 見栄っ張りの募金活動 |
ユーザー |
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提出日時 | 2021-10-19 20:44:10 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 4 ms / 5,000 ms |
コード長 | 3,317 bytes |
コンパイル時間 | 1,747 ms |
コンパイル使用メモリ | 168,028 KB |
実行使用メモリ | 6,948 KB |
最終ジャッジ日時 | 2024-09-20 06:25:18 |
合計ジャッジ時間 | 2,503 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 22 |
ソースコード
/*** @FileName a.cpp* @Author kanpurin* @Created 2021.10.19 20:44:03**/#include "bits/stdc++.h"using namespace std;typedef long long ll;template< int MOD >struct mint {public:unsigned int x;mint() : x(0) {}mint(long long v) {long long w = (long long)(v % (long long)(MOD));if (w < 0) w += MOD;x = (unsigned int)(w);}mint(std::string &s) {unsigned int z = 0;for (int i = 0; i < s.size(); i++) {z *= 10;z += s[i] - '0';z %= MOD;}x = z;}mint operator+() const { return *this; }mint operator-() const { return mint() - *this; }mint& operator+=(const mint &a) {if ((x += a.x) >= MOD) x -= MOD;return *this;}mint& operator-=(const mint &a) {if ((x -= a.x) >= MOD) x += MOD;return *this;}mint& operator*=(const mint &a) {unsigned long long z = x;z *= a.x;x = (unsigned int)(z % MOD);return *this;}mint& operator/=(const mint &a) {return *this = *this * a.inv(); }friend mint operator+(const mint& lhs, const mint& rhs) {return mint(lhs) += rhs;}friend mint operator-(const mint& lhs, const mint& rhs) {return mint(lhs) -= rhs;}friend mint operator*(const mint& lhs, const mint& rhs) {return mint(lhs) *= rhs;}friend mint operator/(const mint& lhs, const mint& rhs) {return mint(lhs) /= rhs;}friend bool operator==(const mint& lhs, const mint& rhs) {return lhs.x == rhs.x;}friend bool operator!=(const mint& lhs, const mint& rhs) {return lhs.x != rhs.x;}friend std::ostream& operator<<(std::ostream &os, const mint &n) {return os << n.x;}friend std::istream &operator>>(std::istream &is, mint &n) {unsigned int x;is >> x;n = mint(x);return is;}mint inv() const {assert(x);return pow(MOD-2);}mint pow(long long n) const {assert(0 <= n);mint p = *this, r = 1;while (n) {if (n & 1) r *= p;p *= p;n >>= 1;}return r;}mint sqrt() const {if (this->x < 2) return *this;if (this->pow((MOD-1)>>1).x != 1) return mint(0);mint b = 1, one = 1;while (b.pow((MOD-1) >> 1) == 1) b += one;long long m = MOD-1, e = 0;while (m % 2 == 0) m >>= 1, e += 1;mint x = this->pow((m - 1) >> 1);mint y = (*this) * x * x;x *= (*this);mint z = b.pow(m);while (y.x != 1) {int j = 0;mint t = y;while (t != one) j += 1, t *= t;z = z.pow(1LL << (e-j-1));x *= z; z *= z; y *= z; e = j;}return x;}};constexpr int MOD = 1e9 + 7;int main() {int n,s,k;cin >> n >> s >> k;s -= k*(n-1)*n/2;if (s < 0) {cout << 0 << endl;return 0;}vector<mint<MOD>> dp(s+1,0);dp[0] = 1;for (int i = 1; i <= n; i++) {for (int j = 0; j <= s-i; j++) {dp[j+i] += dp[j];}}cout << dp[s] << endl;return 0;}