Submission #735637

#	Time	Username	Problem	Language	Result	Execution time	Memory
735637		Jeff12345121	Factories (JOI14_factories)	C++14	15 / 100	8073 ms	176364 KiB

factories

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

typedef long long ll;
vector<vector<pair<int,int>>> g;
int n;
const int nmax = 500005,LOG = 20;
int sz[nmax],is_centroid[nmax],lift[LOG][nmax],depth[nmax],cp[nmax];
ll sol[nmax];
int in_reset[nmax];
long long dis[LOG][nmax];

const ll inf = (1LL << 60);

void get_size(int node, int parent) {
    sz[node] = 1;
    for (auto k : g[node]) {
        if (k.first == parent || is_centroid[k.first]) {
            continue;
        }

        get_size(k.first, node);
        sz[node] += sz[k.first];
    }
}
int get_centroid(int node, int parent, int nr_nodes) {
    int half = nr_nodes / 2;
    for (auto k : g[node]) {
        if (k.first == parent || is_centroid[k.first]) {
            continue;
        }


        if (sz[k.first] > half) {
            return get_centroid(k.first, node, nr_nodes);
        }
    }
    return node;
}
void build_centroid(int node, int centroid_parent) {
    get_size(node, 0);
    int centroid = get_centroid(node,0, sz[node]);

    cp[centroid] = centroid_parent;
    is_centroid[centroid] = 1;
    for (auto k : g[centroid]) {
        if (is_centroid[k.first] == 0) {
            build_centroid(k.first , centroid);
        }
    }
}


void find_parents(int node) {
    for (auto k : g[node]) {
        if (k.first == lift[0][node]) {
            continue;
        }

        lift[0][k.first] = node;
        dis[0][k.first] = k.second;
        depth[k.first] = depth[node] + 1;
        find_parents(k.first);
    }
}
void get_lift() {
    find_parents(1);

    for (int lvl = 1; lvl < LOG; lvl++) {
        for (int i = 1; i <= n; i++) {
            lift[lvl][i] = lift[lvl - 1][lift[lvl - 1][i]];
            dis[lvl][i] = dis[lvl-1][lift[lvl-1][i]] + dis[lvl-1][i];
        }
    }
}
void Init(int N, int A[], int B[], int D[]) {
    n = N;
    g.resize(n + 1);
    for (int i = 1; i < n; i++) {
        A[i - 1]++;
        B[i - 1]++;
        g[A[i - 1]].push_back({B[i - 1] , D[i - 1]});
        g[B[i - 1]].push_back({A[i - 1], D[i - 1]});
    }

    for (int i = 1; i <= n; i++) {
        sol[i] = inf;
    }
    get_lift();
    build_centroid(1, 0);
    return;
}


ll get_dis(int u, int v) {
    if (u == v) {
        return 0LL;
    }

    if (depth[u] < depth[v]) {
        swap(u,v);
    }

    ll cost = 0;
    for (int lvl = LOG - 1; lvl >= 0 && depth[u] > depth[v]; lvl--) {
        if (depth[lift[lvl][u]] >= depth[v]) {
            cost += dis[lvl][u];
            u = lift[lvl][u];
        }
    }

    if (u == v) {
        return cost;
    }

    for (int lvl = LOG - 1; lvl >= 0; lvl--) {
        if (lift[lvl][u] != lift[lvl][v]) {
            cost += dis[lvl][u];
            u = lift[lvl][u];
            cost += dis[lvl][v];
            v = lift[lvl][v];
        }
    }

    cost += dis[0][u];
    cost += dis[0][v];
    return cost;
}
long long Query(int S, int X[], int T, int Y[]) {
    for (int i = 0; i < S;i++) {
        X[i]++;
    }
    for (int i = 0; i < T;i++){
        Y[i]++;
    }

    queue<int> reset_nodes;
    
    for (int i = 1; i <= S; i++) {
        for (int node = X[i - 1]; node != 0; node = cp[node]) {
            sol[node] = min(sol[node] , get_dis(node, X[i - 1]));
            if (!in_reset[node]) {
                in_reset[node] = 1;
                reset_nodes.push(node);
            }
        }
    }

    ll res = inf;
    for (int i = 1; i <= T; i++) {
        for (int node = Y[i - 1]; node != 0; node = cp[node]) {
            res = min(res, sol[node] + get_dis(node, Y[i - 1]));
        }
    }

    while(!reset_nodes.empty()) {
        in_reset[reset_nodes.front()] = 0;
        sol[reset_nodes.front()] = inf;
        reset_nodes.pop();
    }
    return res;
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67