結果

問題 No.1001 注文の多い順列
ユーザー satashunsatashun
提出日時 2020-04-20 17:11:49
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 34 ms / 2,000 ms
コード長 4,547 bytes
コンパイル時間 2,611 ms
コンパイル使用メモリ 210,232 KB
実行使用メモリ 39,164 KB
最終ジャッジ日時 2024-10-06 09:03:42
合計ジャッジ時間 4,119 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 11 ms
39,040 KB
testcase_01 AC 12 ms
39,036 KB
testcase_02 AC 10 ms
39,040 KB
testcase_03 AC 12 ms
39,040 KB
testcase_04 AC 12 ms
39,040 KB
testcase_05 AC 12 ms
39,040 KB
testcase_06 AC 12 ms
38,960 KB
testcase_07 AC 12 ms
39,008 KB
testcase_08 AC 12 ms
38,816 KB
testcase_09 AC 12 ms
39,080 KB
testcase_10 AC 12 ms
39,024 KB
testcase_11 AC 12 ms
38,912 KB
testcase_12 AC 12 ms
38,872 KB
testcase_13 AC 12 ms
38,796 KB
testcase_14 AC 12 ms
38,936 KB
testcase_15 AC 13 ms
38,880 KB
testcase_16 AC 12 ms
39,040 KB
testcase_17 AC 11 ms
38,784 KB
testcase_18 AC 28 ms
38,916 KB
testcase_19 AC 26 ms
39,164 KB
testcase_20 AC 20 ms
39,040 KB
testcase_21 AC 20 ms
38,968 KB
testcase_22 AC 30 ms
39,052 KB
testcase_23 AC 31 ms
39,040 KB
testcase_24 AC 31 ms
39,040 KB
testcase_25 AC 31 ms
38,912 KB
testcase_26 AC 22 ms
38,912 KB
testcase_27 AC 23 ms
38,940 KB
testcase_28 AC 23 ms
38,988 KB
testcase_29 AC 31 ms
39,024 KB
testcase_30 AC 29 ms
39,004 KB
testcase_31 AC 31 ms
39,040 KB
testcase_32 AC 31 ms
38,912 KB
testcase_33 AC 34 ms
38,892 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

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

using ll = long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define ALL(c) (c).begin(), (c).end()

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "{";
    rep(i, v.size()) {
        if (i) os << ",";
        os << v[i];
    }
    os << "}";
    return os;
}

#ifdef LOCAL
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << H;
    debug_out(T...);
}
#define debug(...) \
    cerr << __LINE__ << " [" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

template <unsigned int MOD>
struct ModInt {
    using uint = unsigned int;
    using ull = unsigned long long;
    using M = ModInt;

    uint v;

    ModInt(ll _v = 0) { set_norm(_v % MOD + MOD); }
    M& set_norm(uint _v) {  //[0, MOD * 2)->[0, MOD)
        v = (_v < MOD) ? _v : _v - MOD;
        return *this;
    }

    explicit operator bool() const { return v != 0; }
    M operator+(const M& a) const { return M().set_norm(v + a.v); }
    M operator-(const M& a) const { return M().set_norm(v + MOD - a.v); }
    M operator*(const M& a) const { return M().set_norm(ull(v) * a.v % MOD); }
    M operator/(const M& a) const { return *this * a.inv(); }
    M& operator+=(const M& a) { return *this = *this + a; }
    M& operator-=(const M& a) { return *this = *this - a; }
    M& operator*=(const M& a) { return *this = *this * a; }
    M& operator/=(const M& a) { return *this = *this / a; }
    M operator-() const { return M() - *this; }
    M& operator++(int) { return *this = *this + 1; }
    M& operator--(int) { return *this = *this - 1; }

    M pow(ll n) const {
        if (n < 0) return inv().pow(-n);
        M x = *this, res = 1;
        while (n) {
            if (n & 1) res *= x;
            x *= x;
            n >>= 1;
        }
        return res;
    }

    M inv() const {
        ll a = v, b = MOD, p = 1, q = 0, t;
        while (b != 0) {
            t = a / b;
            swap(a -= t * b, b);
            swap(p -= t * q, q);
        }
        return M(p);
    }

    bool operator==(const M& a) const { return v == a.v; }
    bool operator!=(const M& a) const { return v != a.v; }
    friend ostream& operator<<(ostream& os, const M& a) { return os << a.v; }
    static int get_mod() { return MOD; }
};

using Mint = ModInt<TEN(9) + 7>;

const int maxv = 10010;

V<Mint> fact(maxv), ifact(maxv), inv(maxv);

void init() {
    fact[0] = 1;
    for (int i = 1; i < maxv; ++i) {
        fact[i] = fact[i - 1] * i;
    }

    ifact[maxv - 1] = fact[maxv - 1].inv();

    for (int i = maxv - 2; i >= 0; --i) {
        ifact[i] = ifact[i + 1] * (i + 1);
    }

    for (int i = 1; i < maxv; ++i) {
        inv[i] = ifact[i] * fact[i - 1];
    }
}

Mint comb(int n, int r) {
    if (n < 0 || r < 0 || r > n) return Mint(0);
    return fact[n] * ifact[r] * ifact[n - r];
}

Mint dp[3010][3010];

int main() {
    init();

    int N;
    cin >> N;
    V<pii> cond(N);
    rep(i, N) {
        int t, x;
        cin >> t >> x;
        if (t) {
            --x;
        }
        --x;
        cond[i] = mp(x, t);
    }
    sort(ALL(cond));

    dp[0][0] = 1;
    rep(i, N) {
        for (int j = 0; j <= i; ++j) {
            int c = cond[i].fi - j + 1;
            bool t = cond[i].se;
            if (c > 0) {
                if (t) {
                    dp[i + 1][j + 1] -= dp[i][j] * c;
                } else {
                    dp[i + 1][j + 1] += dp[i][j] * c;
                }
            }
            if (t) {
                dp[i + 1][j] += dp[i][j];
            }
        }
    }

    Mint ans;
    for (int j = 0; j <= N; ++j) {
        ans += dp[N][j] * fact[N - j];
    }
    cout << ans << endl;

    return 0;
}
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