oj.uz

답안 #964589

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
964589 2024-04-17T07:17:12 Z vjudge1 공장들 (JOI14_factories) C++17
0 / 100
 2844 ms 222284 KB 
#include <bits/stdc++.h>

#ifdef DEBUG
    #include <debug.hpp>
#else
    #define debug(...) 42
#endif

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using namespace std;

const ll INF = 1e18;

vector<vector<pair<int, ll>>> gr;
vector<int> sz, used, act;
vector<ll> cls;
vector<vector<int>> cent;
vector<vector<ll>> dist;
int now = 0;

int find_sz(int v, int p) {
    sz[v] = 1;
    for (auto [to, w] : gr[v]) {
        if (used[to] || to == p) continue;
        sz[v] += find_sz(to, v);
    }
    return sz[v];
}

int centr(int v, int p, int cn) {
    bool flag = 1;
    while (flag) {
        flag = 0;
        for (auto [to, w] : gr[v]) {
            if (used[to] || to == p) continue;
            if (sz[to] > cn / 2) {
                p = v;
                v = to;
                flag = 1;
                break;
            }
        }
    }
    return v;
}

void dfs(int v, int c, int p = -1, int d = 0) {
    cent[v].push_back(c);
    dist[v].push_back(d);
    for (auto [to, w] : gr[v]) {
        if (used[to] || to == p) continue;
        dfs(to, c, v, d + w);
    }
} 

void Decomp(int v) {
    int cn = find_sz(v, v);
    int c = centr(v, v, cn); 
    used[c] = 1;
    dfs(c, c);
    for (auto [to, w] : gr[c]) {
        if (used[to]) continue;
        Decomp(to);
    }
}

void Init(int N, int A[], int B[], int D[]) {
    gr.assign(N, {}); 
    used.assign(N, 0);
    sz.assign(N, 0);
    cent.assign(N, {});
    dist.assign(N, {});
    cls.assign(N, INF);
    act.assign(N, 0);
    
    for (int i = 0; i < N; ++i) {
        gr[A[i]].emplace_back(B[i], D[i]);
        gr[B[i]].emplace_back(A[i], D[i]);
    }

    Decomp(0);
}

void Update(int v) {
    for (size_t j = 0; j < cent[v].size(); ++j) {
        int c = cent[v][j];
        if (act[c] == now) {
            cls[c] = min(cls[c], dist[v][j]);
        } else {
            cls[c] = dist[v][j]; 
            act[c] = now;
        }
    }
}

ll GetMin(int v) {
    ll res = INF;
    for (size_t j = 0; j < cent[v].size(); ++j) {
        int c = cent[v][j];
        if (act[c] == now) {
            res = min(res, dist[v][j] + cls[c]);
        }
    }
    return res;
}

ll Query(int S, int X[], int T, int Y[]) {
    // go through all X[i] centroids and update cls  
    for (int i = 0; i < S; ++i) {
        Update(X[i]);
    }

    // go through all Y[i] centroids and update min(res, dist[Y[i]][c] + cls[c])
    ll res = INF;
    for (int i = 0; i < T; ++i) {
        res = min(res, GetMin(Y[i])); 
    }

    // Update actuality
    ++now;

    return res;
}

// int main() {
//     int n, q;
//     cin >> n >> q;
//     
//     vector<int> a(n), b(n), d(n);
//     for (int i = 0; i < n - 1; ++i) {
//         cin >> a[i] >> b[i] >> d[i];
//     }
//
//     Init(n, a.data(), b.data(), d.data());
//     
//     int s, t;
//     for (int i = 0; i < q; ++i) {
//         cin >> s >> t;
//         vector<int> x(s), y(t);
//         for (int j = 0; j < s; ++j) {
//             cin >> x[j];
//         }
//         for (int j = 0; j < t; ++j) {
//             cin >> y[j];
//         }
//         cout << Query(s, x.data(), t, y.data()) << "\n";
//     }
// }

Subtask #1
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 16984 KB Output is correct
2 Correct 244 ms 31896 KB Output is correct
3 Incorrect 247 ms 32352 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16988 KB Output is correct
2 Incorrect 2844 ms 222284 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 67.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 16984 KB Output is correct
2 Correct 244 ms 31896 KB Output is correct
3 Incorrect 247 ms 32352 KB Output isn't correct
4 Halted 0 ms 0 KB -