oj.uz

Submission #623600

# Submission time Handle Problem Language Result Execution time Memory
623600 2022-08-06T04:10:55 Z Hanksburger Synchronization (JOI13_synchronization) C++17
100 / 100
 234 ms 20544 KB 
#include <bits/stdc++.h>
using namespace std;
int par[100005][17], bit[100005], ok[100005], in[100005], out[100005], a[100005], b[100005], n, m, q, t;
vector<pair<int, int> > edge;
vector<int> adj[100005];
void update(int x, int y)
{
    for (int i=x; i<=n; i+=i&(-i))
        bit[i]+=y;
}
int query(int x)
{
    int ans=0;
    for (int i=x; i; i-=i&(-i))
        ans+=bit[i];
    return ans;
}
int findPar(int u)
{
    for (int i=16; i>=0; i--)
        if (query(in[u])==query(in[par[u][i]]))
            u=par[u][i];
    return u;
}
void dfs(int u, int p)
{
    par[u][0]=p;
    for (int i=1; i<=16; i++)
        par[u][i]=par[par[u][i-1]][i-1];
    in[u]=++t;
    for (int v:adj[u])
        if (v!=p)
            dfs(v, u);
    out[u]=t+1;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m >> q;
    for (int i=1; i<n; i++)
    {
        int u, v;
        cin >> u >> v;
        edge.push_back({u, v});
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1, 1);
    for (int i=1; i<=n; i++)
    {
        update(in[i], 1);
        update(out[i], -1);
        a[i]=1;
    }
    for (int i=1; i<=m; i++)
    {
        int x, u, v, w;
        cin >> x;
        u=edge[x-1].first;
        v=edge[x-1].second;
        if (par[u][0]==v)
            swap(u, v);
        w=findPar(u);
        if (ok[x])
        {
            a[v]=b[v]=a[w];
            update(in[v], 1);
            update(out[v], -1);
        }
        else
        {
            a[w]+=a[v]-b[v];
            update(in[v], -1);
            update(out[v], 1);
        }
        ok[x]^=1;
    }
    for (int i=1; i<=q; i++)
    {
        int x;
        cin >> x;
        cout << a[findPar(x)] << '\n';
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 12 ms 4052 KB Output is correct
8 Correct 13 ms 3924 KB Output is correct
9 Correct 13 ms 3964 KB Output is correct
10 Correct 167 ms 15676 KB Output is correct
11 Correct 169 ms 15680 KB Output is correct
12 Correct 176 ms 20272 KB Output is correct
13 Correct 90 ms 15932 KB Output is correct
14 Correct 117 ms 15264 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 80 ms 17752 KB Output is correct
2 Correct 83 ms 17652 KB Output is correct
3 Correct 87 ms 19856 KB Output is correct
4 Correct 84 ms 19932 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 3 ms 2772 KB Output is correct
7 Correct 17 ms 4492 KB Output is correct
8 Correct 234 ms 20484 KB Output is correct
9 Correct 225 ms 20408 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 228 ms 20376 KB Output is correct
2 Correct 159 ms 20544 KB Output is correct
3 Correct 141 ms 20468 KB Output is correct
4 Correct 135 ms 20528 KB Output is correct

Subtask #5
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 20 ms 4180 KB Output is correct
7 Correct 220 ms 15928 KB Output is correct
8 Correct 219 ms 20408 KB Output is correct
9 Correct 117 ms 16484 KB Output is correct
10 Correct 153 ms 15952 KB Output is correct
11 Correct 110 ms 18400 KB Output is correct
12 Correct 110 ms 18452 KB Output is correct
13 Correct 141 ms 20516 KB Output is correct