Submission #171398

#	Time	Username	Problem	Language	Result	Execution time	Memory
171398		kuroni	Synchronization (JOI13_synchronization)	C++17	0 / 100	8020 ms	262144 KiB

synchronization

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

const int N = 1E5 + 5, M = 2E5 + 5;

int n, m, q, d, u, f[N], g[N], ue[N], ve[N], que[N], lz[N], col[N];
bool chk[N], mod[N];
vector<int> adj[N], com[N];

void init() {
    for (int i = 1; i <= n; i++) {
        lz[i] = col[i] = 0;
        mod[i] = false;
        adj[i].clear(); com[i].clear();
    }
}

void DFS(int u, int p = 0) {
    col[u] = col[p];
    for (int &v : adj[u]) {
        int c = u ^ ue[v] ^ ve[v];
        if (c != p) {
            DFS(c, u);
        }
    }
}

void update(int u, int dif, int p = 0) {
    f[u] += dif; lz[u] += dif;
    for (int &v : com[u]) {
        int c = u ^ col[ue[v]] ^ col[ve[v]];
        if (!chk[v]) {
            g[v] += dif;
        } else if (c != p) {
            update(c, dif, u);
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m >> q;
    fill(f + 1, f + n + 1, 1);
    for (int i = 1; i < n; i++) {
        cin >> ue[i] >> ve[i];
        g[i] = 2;
    }
    for (int i = 1; i <= m; i++) {
        cin >> que[i];
    }
    d = sqrt(m);
    for (int bl = 1; bl <= m; bl += d) {
        init();
        for (int i = 0; i < d && bl + i <= m; i++) {
            mod[que[bl + i]] = true;
        }
        for (int i = 1; i < n; i++) {
            if (!mod[i] && chk[i]) {
                adj[ue[i]].push_back(i);
                adj[ve[i]].push_back(i);
            }
        }
        for (int i = 1; i <= n; i++) {
            if (col[i] == 0) {
                col[0] = i;
                DFS(i);
            }
        }
        for (int i = 1; i < n; i++) {
            if (mod[i]) {
                com[col[ue[i]]].push_back(i);
                com[col[ve[i]]].push_back(i);
            }
        }
        for (int i = 0; i < d && bl + i <= m; i++) {
            int e = que[bl + i];
            if (!chk[e]) {
                int sum = (f[col[ue[e]]] + f[col[ve[e]]] + g[e]) / 2;
                update(col[ue[e]], sum - f[col[ue[e]]]);
                update(col[ve[e]], sum - f[col[ve[e]]]);
                g[e] = 0;
            }
            chk[e] = !chk[e];
        }
        for (int i = 1; i < n; i++) {
            if (!mod[i] && !chk[i]) {
                g[i] += lz[col[ue[i]]] + lz[col[ve[i]]];
            }
        }
    }
    while (q--) {
        cin >> u;
        cout << f[u] << '\n';
    }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 10
• Subtask 4: 0 / 20
• Subtask 5: 0 / 40