結果

問題 No.1207 グラフX
ユーザー first_vilfirst_vil
提出日時 2020-08-30 16:32:06
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 217 ms / 2,000 ms
コード長 6,086 bytes
コンパイル時間 2,519 ms
コンパイル使用メモリ 216,372 KB
実行使用メモリ 24,064 KB
最終ジャッジ日時 2024-04-27 10:11:31
合計ジャッジ時間 11,293 ms
ジャッジサーバーID
(参考情報)
judge5 / judge4
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 169 ms
17,248 KB
testcase_01 AC 172 ms
17,252 KB
testcase_02 AC 169 ms
17,272 KB
testcase_03 AC 169 ms
17,252 KB
testcase_04 AC 169 ms
17,248 KB
testcase_05 AC 217 ms
23,984 KB
testcase_06 AC 215 ms
23,904 KB
testcase_07 AC 210 ms
23,912 KB
testcase_08 AC 131 ms
11,388 KB
testcase_09 AC 144 ms
14,204 KB
testcase_10 AC 205 ms
20,088 KB
testcase_11 AC 212 ms
24,064 KB
testcase_12 AC 132 ms
12,248 KB
testcase_13 AC 69 ms
6,944 KB
testcase_14 AC 163 ms
16,592 KB
testcase_15 AC 141 ms
13,448 KB
testcase_16 AC 73 ms
6,940 KB
testcase_17 AC 123 ms
10,816 KB
testcase_18 AC 92 ms
11,244 KB
testcase_19 AC 102 ms
8,064 KB
testcase_20 AC 165 ms
17,032 KB
testcase_21 AC 12 ms
6,940 KB
testcase_22 AC 105 ms
11,196 KB
testcase_23 AC 111 ms
12,348 KB
testcase_24 AC 77 ms
10,324 KB
testcase_25 AC 164 ms
16,852 KB
testcase_26 AC 129 ms
13,260 KB
testcase_27 AC 154 ms
15,184 KB
testcase_28 AC 146 ms
14,272 KB
testcase_29 AC 147 ms
15,032 KB
testcase_30 AC 71 ms
7,808 KB
testcase_31 AC 55 ms
6,940 KB
testcase_32 AC 58 ms
8,192 KB
testcase_33 AC 64 ms
8,064 KB
testcase_34 AC 137 ms
13,304 KB
testcase_35 AC 13 ms
6,944 KB
testcase_36 AC 139 ms
14,000 KB
testcase_37 AC 120 ms
11,416 KB
testcase_38 AC 30 ms
6,940 KB
testcase_39 AC 70 ms
8,768 KB
testcase_40 AC 42 ms
6,940 KB
testcase_41 AC 91 ms
8,320 KB
testcase_42 AC 2 ms
6,944 KB
testcase_43 AC 2 ms
6,944 KB
testcase_44 AC 2 ms
6,944 KB
testcase_45 AC 154 ms
17,364 KB
testcase_46 AC 160 ms
17,368 KB
testcase_47 AC 154 ms
17,368 KB
testcase_48 AC 155 ms
17,368 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 ld = long double;
using VI = vector<int>;
using VL = vector<ll>;
using VS = vector<string>;
template<class T> using PQ = priority_queue<T, vector<T>, greater<T>>;
#define FOR(i,a,n) for(int i=(a);i<(n);++i)
#define eFOR(i,a,n) for(int i=(a);i<=(n);++i)
#define rFOR(i,a,n) for(int i=(n)-1;i>=(a);--i)
#define erFOR(i,a,n) for(int i=(n);i>=(a);--i)
#define each(i, a) for(auto &i : a)
#define SORT(a) sort(a.begin(),a.end())
#define rSORT(a) sort(a.rbegin(),a.rend())
#define fSORT(a,f) sort(a.begin(),a.end(),f)
#define all(a) a.begin(),a.end()
#define out(y,x) ((y)<0||h<=(y)||(x)<0||w<=(x))
#define tp(a,i) get<i>(a)
#define line cout << "-----------------------------\n" 
#define ENDL(i,n) ((i) == (n) - 1 ? "\n" : " ")
#define stop system("pause")
constexpr ll INF = 1000000000;
constexpr ll LLINF = 1LL << 60;
constexpr ll mod = 1000000007;
constexpr ll MOD = 998244353;
constexpr ld eps = 1e-10;
constexpr ld pi = 3.1415926535897932;
template<class T>inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; }return false; }
template<class T>inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; }return false; }
inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); }
template<class T>inline istream& operator>>(istream& is, vector<T>& v) { for (auto& a : v)is >> a; return is; }
template<class T>inline istream& operator>>(istream& is, deque<T>& v) { for (auto& a : v)is >> a; return is; }
template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template<class T>inline vector<T> vec(size_t a) { return vector<T>(a); }
template<class T>inline vector<T> defvec(T def, size_t a) { return vector<T>(a, def); }
template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return vector<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); }
template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return vector<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); }
template<class T>inline void print(const T& a) { cout << a << "\n"; }
template<class T, class... Ts>inline void print(const T& a, const Ts&... ts) { cout << a << " "; print(ts...); }
template<class T>inline void print(const vector<T>& v) { for (int i = 0; i < v.size(); ++i)cout << v[i] << (i == v.size() - 1 ? "\n" : " "); }
template<class T>inline void print(const vector<vector<T>>& v) { for (auto& a : v)print(a); }
inline string reversed(const string& s) { string t = s; reverse(all(t)); return t; }

template<int modulo> struct ModInt {
    int x;

    ModInt() : x(0) {}
    ModInt(ll y) : x(y >= 0 ? y % modulo : (modulo - (-y) % modulo) % modulo) {}

    ModInt& operator+=(const ModInt& p) {
        if ((x += p.x) >= modulo) x -= modulo;
        return *this;
    }
    ModInt& operator-=(const ModInt& p) {
        if ((x += modulo - p.x) >= modulo) x -= modulo;
        return *this;
    }
    ModInt& operator*=(const ModInt& p) {
        x = (int)(1LL * x * p.x % modulo);
        return *this;
    }
    ModInt& operator/=(const ModInt& p) {
        *this *= p.inverse();
        return *this;
    }

    ModInt operator-() const { return ModInt(-x); }
    ModInt operator+(const ModInt& p) const { return ModInt(*this) += p; }
    ModInt operator-(const ModInt& p) const { return ModInt(*this) -= p; }
    ModInt operator*(const ModInt& p) const { return ModInt(*this) *= p; }
    ModInt operator/(const ModInt& p) const { return ModInt(*this) /= p; }

    bool operator==(const ModInt& p) const { return x == p.x; }
    bool operator!=(const ModInt& p) const { return x != p.x; }

    ModInt inverse() const {
        int a = x, b = modulo, u = 1, v = 0, t;
        while (b > 0) {
            t = a / b;
            a -= t * b;
            swap(a, b);
            u -= t * v;
            swap(u, v);
        }
        return ModInt(u);
    }

    ModInt pow(ll e) {
        ll a = 1, p = x;
        while (e > 0) {
            if (e % 2 == 0) {
                p = (p * p) % modulo;
                e /= 2;
            }
            else {
                a = (a * p) % modulo;
                e--;
            }
        }
        return ModInt(a);
    }

    friend ostream& operator<<(ostream& os, const ModInt<modulo>& p) {
        return os << p.x;
    }
    friend istream& operator>>(istream& is, ModInt<modulo>& a) {
        ll x;
        is >> x;
        a = ModInt<modulo>(x);
        return (is);
    }
};
using modint = ModInt<mod>;

class unionfind {
    VI par, rank;
    int forest_num;
public:
    unionfind(const int& n) : par(n), rank(n, 1), forest_num(n) {
        FOR(i, 0, n)par[i] = i;
    }
    int root(int x) {
        if (par[x] == x)return x;
        return par[x] = root(par[x]);
    }
    int size(int x) {
        if (par[x] == x)return rank[x];
        return size(par[x]);
    }
    void unite(int x, int y) {
        int rx = root(x), ry = root(y);
        if (rx == ry)return;
        if (rank[rx] < rank[ry]) {
            par[rx] = ry;
            rank[ry] += rank[rx];
        }
        else {
            par[ry] = rx;
            rank[rx] += rank[ry];
        }
        --forest_num;
    }
    bool same(int x, int y) { return root(x) == root(y); }
    int fnum() { return forest_num; }
};

int main() {
    init();

    int n, m; modint x; cin >> n >> m >> x;
    vector<vector<pair<int, int>>> g(n);
    unionfind uf(n);
    FOR(i, 0, m) {
        int a, b, c; cin >> a >> b >> c;
        --a, --b;
        if (uf.same(a, b))continue;
        uf.unite(a, b);
        g[a].emplace_back(b, c);
        g[b].emplace_back(a, c);
    }

    modint ans = 0;
    auto dfs = [&](auto&& f, int cur, int par)->ll {
        ll res = 1;
        for (auto [to, c] : g[cur]) {
            if (to == par)continue;
            ll k = f(f, to, cur);
            ans += x.pow(c) * (k * (n - k));
            res += k;
        }
        return res;
    };
    dfs(dfs, 0, -1);
    print(ans);

    return 0;
}
0