結果

問題 No.1124 Earthquake Safety
ユーザー satashunsatashun
提出日時 2020-07-23 19:44:25
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 352 ms / 3,000 ms
コード長 4,225 bytes
コンパイル時間 3,213 ms
コンパイル使用メモリ 208,596 KB
実行使用メモリ 106,184 KB
最終ジャッジ日時 2023-09-05 23:03:00
合計ジャッジ時間 17,910 ms
ジャッジサーバーID
(参考情報)
judge11 / judge15
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 1 ms
4,380 KB
testcase_01 AC 1 ms
4,380 KB
testcase_02 AC 1 ms
4,376 KB
testcase_03 AC 1 ms
4,380 KB
testcase_04 AC 2 ms
4,380 KB
testcase_05 AC 2 ms
4,376 KB
testcase_06 AC 2 ms
4,376 KB
testcase_07 AC 8 ms
4,412 KB
testcase_08 AC 94 ms
15,712 KB
testcase_09 AC 331 ms
40,976 KB
testcase_10 AC 231 ms
106,184 KB
testcase_11 AC 1 ms
4,380 KB
testcase_12 AC 1 ms
4,376 KB
testcase_13 AC 2 ms
4,380 KB
testcase_14 AC 342 ms
40,928 KB
testcase_15 AC 349 ms
40,924 KB
testcase_16 AC 348 ms
40,964 KB
testcase_17 AC 352 ms
40,740 KB
testcase_18 AC 343 ms
40,712 KB
testcase_19 AC 332 ms
40,916 KB
testcase_20 AC 344 ms
41,036 KB
testcase_21 AC 342 ms
40,940 KB
testcase_22 AC 338 ms
40,744 KB
testcase_23 AC 323 ms
40,652 KB
testcase_24 AC 334 ms
40,712 KB
testcase_25 AC 311 ms
40,968 KB
testcase_26 AC 313 ms
41,072 KB
testcase_27 AC 311 ms
44,360 KB
testcase_28 AC 310 ms
44,408 KB
testcase_29 AC 321 ms
56,076 KB
testcase_30 AC 326 ms
56,024 KB
testcase_31 AC 344 ms
81,068 KB
testcase_32 AC 337 ms
76,388 KB
testcase_33 AC 333 ms
74,492 KB
testcase_34 AC 331 ms
80,124 KB
testcase_35 AC 313 ms
40,396 KB
testcase_36 AC 300 ms
40,696 KB
testcase_37 AC 293 ms
41,824 KB
testcase_38 AC 288 ms
41,560 KB
testcase_39 AC 286 ms
41,300 KB
testcase_40 AC 286 ms
41,824 KB
testcase_41 AC 281 ms
41,524 KB
testcase_42 AC 275 ms
42,032 KB
testcase_43 AC 273 ms
42,296 KB
testcase_44 AC 273 ms
42,536 KB
testcase_45 AC 270 ms
41,760 KB
testcase_46 AC 270 ms
42,000 KB
testcase_47 AC 270 ms
41,840 KB
testcase_48 AC 267 ms
41,828 KB
testcase_49 AC 273 ms
41,660 KB
testcase_50 AC 1 ms
4,376 KB
testcase_51 AC 1 ms
4,380 KB
testcase_52 AC 1 ms
4,376 KB
testcase_53 AC 1 ms
4,376 KB
testcase_54 AC 2 ms
4,376 KB
testcase_55 AC 1 ms
4,380 KB
testcase_56 AC 2 ms
4,376 KB
testcase_57 AC 2 ms
4,376 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 per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (int i = int(b) - 1; i >= int(a); 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>;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;
    VV<int> g(N);

    rep(i, N - 1) {
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].pb(b);
        g[b].pb(a);
    }

    VV<Mint> dp(N, V<Mint>(8));

    auto dfs = [&](auto self, int v, int p) -> void {
        V<Mint> cur(8);
        rep(i, 8) { cur[i] = 1; }

        for (int to : g[v]) {
            if (to != p) {
                self(self, to, v);
                V<Mint> nx(8);
                rep(bt, 8) {
                    rep(ch, 8) {
                        if (!(bt & ch))
                            nx[bt | ch] += cur[bt] * dp[to][ch] *
                                           ((ch == 7 || ch == 0) ? 2 : 1);
                    }
                }
                cur = nx;
            }
        }
        dp[v] = cur;
        debug(v, dp[v]);
    };

    dfs(dfs, 0, -1);
    cout << dp[0][7] << endl;

    return 0;
}
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