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답안 #1108369

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1108369 2024-11-04T01:59:15 Z Zero_OP Designated Cities (JOI19_designated_cities) C++14
16 / 100
 176 ms 52472 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(v) begin(v), end(v)
#define compact(v) v.erase(unique(all(v)), end(v))
#define sz(v) (int)v.size()

template<typename T>
    bool minimize(T& a, const T& b){
        if(a > b){
            return a = b, true;
        }
        return false;
    }
template<typename T>
    bool maximize(T& a, const T& b){
        if(a < b){
            return a = b, true;
        }
        return false;
    }

using ll = long long;
using ld = long double;
using ull = unsigned long long;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

#ifdef LOCAL
    freopen("task.inp", "r", stdin);
    freopen("task.out", "w", stdout);
#endif // LOCAL

    int N;
    cin >> N;
    vector<vector<tuple<int, int, int>>> adj(N);
    for(int i = 0; i < N - 1; ++i){
        int u, v, c, d;
        cin >> u >> v >> c >> d;
        --u, --v;
        adj[u].emplace_back(v, c, d);
        adj[v].emplace_back(u, d, c);
    }

    vector<ll> f(N), g(N), up(N), down(N);

    function<void(int, int)> dfs = [&](int u, int p){
        for(auto [v, c, d] : adj[u]) if(v != p){
            down[v] = down[u] + c;
            up[v] = up[u] + d;
            dfs(v, u);
            f[u] += f[v] + c;
        }
    };

    dfs(0, -1);
    g[0] = f[0];

    function<void(int, int)> reroot_dfs = [&](int u, int p){
        for(auto [v, c, d] : adj[u]) if(v != p){
            g[v] = g[u] - c + d;
            reroot_dfs(v, u);
        }
    };

    reroot_dfs(0, -1);
    vector<long long> answer(N + 1, LLONG_MAX);

    for(int i = 0; i < N; ++i){
        minimize(answer[1], g[i]);
    }

    const long long inf = 1e18;
    vector<pair<long long, int>> lowest(N, {-inf, -1});
    tuple<long long, int, int> solution_for_two_leaves = {inf, -1, -1};

    for(int u = 0; u < N; ++u){
        if((int)adj[u].size() == 1){
            lowest[u] = {down[u], u};
        }
    }

    function<void(int, int)> dfs_dp = [&](int u, int p){
        pair<long long, int> A = lowest[u], B = {-inf, -1};

        for(auto [v, c, d] : adj[u]) if(v != p){
            dfs_dp(v, u);

            if(A < lowest[v]){
                B = A;
                A = lowest[v];
            } else maximize(B, lowest[v]);

            maximize(lowest[u], lowest[v]);
        }

        if(B.first != -inf){
            long long delta = 2 * down[u] - A.first - B.first + up[u] - down[u];
            int u = A.second, v = B.second;

            minimize(solution_for_two_leaves, make_tuple(delta, u, v));
        }
    };

    dfs_dp(0, -1);

    long long delta;
    int l1, l2;
    tie(delta, l1, l2) = solution_for_two_leaves;
    answer[2] = f[0] + delta;

    int Q;
    cin >> Q;
    while(Q--){
        int k;
        cin >> k;
        cout << answer[k] << '\n';
    }

    return 0;
}

Compilation message

designated_cities.cpp: In lambda function:
designated_cities.cpp:51:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   51 |         for(auto [v, c, d] : adj[u]) if(v != p){
      |                  ^
designated_cities.cpp: In lambda function:
designated_cities.cpp:63:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   63 |         for(auto [v, c, d] : adj[u]) if(v != p){
      |                  ^
designated_cities.cpp: In lambda function:
designated_cities.cpp:89:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   89 |         for(auto [v, c, d] : adj[u]) if(v != p){
      |                  ^

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 121 ms 24136 KB Output is correct
3 Correct 166 ms 42572 KB Output is correct
4 Correct 121 ms 24292 KB Output is correct
5 Correct 129 ms 24156 KB Output is correct
6 Correct 145 ms 26924 KB Output is correct
7 Correct 118 ms 24060 KB Output is correct
8 Correct 159 ms 43336 KB Output is correct
9 Correct 86 ms 24572 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 143 ms 24288 KB Output is correct
3 Correct 159 ms 52472 KB Output is correct
4 Correct 123 ms 29208 KB Output is correct
5 Correct 126 ms 30464 KB Output is correct
6 Correct 157 ms 33864 KB Output is correct
7 Correct 95 ms 30708 KB Output is correct
8 Correct 176 ms 43080 KB Output is correct
9 Correct 90 ms 30712 KB Output is correct

Subtask #4
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 121 ms 24136 KB Output is correct
3 Correct 166 ms 42572 KB Output is correct
4 Correct 121 ms 24292 KB Output is correct
5 Correct 129 ms 24156 KB Output is correct
6 Correct 145 ms 26924 KB Output is correct
7 Correct 118 ms 24060 KB Output is correct
8 Correct 159 ms 43336 KB Output is correct
9 Correct 86 ms 24572 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 143 ms 24288 KB Output is correct
12 Correct 159 ms 52472 KB Output is correct
13 Correct 123 ms 29208 KB Output is correct
14 Correct 126 ms 30464 KB Output is correct
15 Correct 157 ms 33864 KB Output is correct
16 Correct 95 ms 30708 KB Output is correct
17 Correct 176 ms 43080 KB Output is correct
18 Correct 90 ms 30712 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Incorrect 134 ms 30668 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Incorrect 1 ms 336 KB Output isn't correct
3 Halted 0 ms 0 KB -