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Submission #862245

# Submission time Handle Problem Language Result Execution time Memory
862245 2023-10-17T20:19:23 Z Hanksburger Meetings 2 (JOI21_meetings2) C++17
100 / 100
 266 ms 43160 KB 
#include <bits/stdc++.h>
using namespace std;
int par[200005][20], sz[200005], dep[200005], ans[200005], n, c, x, y, ind, res=1;
vector<pair<int, int> > vec;
vector<int> adj[200005];
void dfs(int u, int p)
{
    sz[u]=1;
    for (int v:adj[u])
    {
        if (v!=p)
        {
            dfs(v, u);
            sz[u]+=sz[v];
        }
    }
    bool ok=1;
    for (int v:adj[u])
    {
        if (sz[v]>n/2)
        {
            ok=0;
            break;
        }
    }
    if (ok && n-sz[u]<=n/2)
        c=x=y=u;
}
void dfs2(int u, int p)
{
    par[u][0]=p;
    for (int i=1; i<20; i++)
        par[u][i]=par[par[u][i-1]][i-1];
    sz[u]=1;
    for (int v:adj[u])
    {
        if (v!=p)
        {
            dep[v]=dep[u]+1;
            dfs2(v, u);
            sz[u]+=sz[v];
        }
    }
}
int lca(int u, int v)
{
    if (dep[u]<dep[v])
        swap(u, v);
    if (dep[u]>dep[v])
    {
        int diff=dep[u]-dep[v];
        for (int i=0; i<20; i++)
            if (diff&(1<<i))
                u=par[u][i];
    }
    if (u==v)
        return u;
    for (int i=19; i>=0; i--)
        if (par[u][i]!=par[v][i])
            u=par[u][i], v=par[v][i];
    return par[u][0];
}
int len(int u, int v)
{
    return dep[u]+dep[v]-dep[lca(u, v)]*2;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i=1; i<n; i++)
    {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1, 1);
    dfs2(c, c);
    for (int i=1; i<=n; i++)
        if (i!=c)
            vec.push_back({min(sz[i], n-sz[i]+1), i});
    sort(vec.begin(), vec.end(), greater<pair<int, int> >());
    for (int i=n; i>=1; i--)
    {
        if (i&1)
        {
            ans[i]=1;
            continue;
        }
        while (ind<vec.size() && vec[ind].first>=i/2)
        {
            int u=vec[ind].second;
            int xy=len(x, y);
            int ux=len(u, x);
            int uy=len(u, y);
            if (ux>=uy && ux>xy)
            {
                y=u;
                res=ux+1;
            }
            else if (uy>ux && uy>xy)
            {
                x=u;
                res=uy+1;
            }
            ind++;
        }
        ans[i]=res;
    }
    for (int i=1; i<=n; i++)
        cout << ans[i] << '\n';
}

Compilation message

meetings2.cpp: In function 'int main()':
meetings2.cpp:93:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |         while (ind<vec.size() && vec[ind].first>=i/2)
      |                ~~~^~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8628 KB Output is correct
9 Correct 2 ms 8792 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct
11 Correct 2 ms 8792 KB Output is correct
12 Correct 1 ms 8796 KB Output is correct
13 Correct 1 ms 8796 KB Output is correct
14 Correct 2 ms 8792 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 1 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 1 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct
21 Correct 2 ms 8796 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8628 KB Output is correct
9 Correct 2 ms 8792 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct
11 Correct 2 ms 8792 KB Output is correct
12 Correct 1 ms 8796 KB Output is correct
13 Correct 1 ms 8796 KB Output is correct
14 Correct 2 ms 8792 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 1 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 1 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct
21 Correct 2 ms 8796 KB Output is correct
22 Correct 4 ms 9052 KB Output is correct
23 Correct 4 ms 9052 KB Output is correct
24 Correct 4 ms 9048 KB Output is correct
25 Correct 4 ms 9052 KB Output is correct
26 Correct 4 ms 8932 KB Output is correct
27 Correct 4 ms 9052 KB Output is correct
28 Correct 4 ms 9008 KB Output is correct
29 Correct 4 ms 9052 KB Output is correct
30 Correct 4 ms 9052 KB Output is correct
31 Correct 4 ms 9052 KB Output is correct
32 Correct 4 ms 9052 KB Output is correct
33 Correct 4 ms 9052 KB Output is correct
34 Correct 3 ms 9052 KB Output is correct
35 Correct 3 ms 9052 KB Output is correct
36 Correct 4 ms 9052 KB Output is correct
37 Correct 3 ms 8856 KB Output is correct
38 Correct 5 ms 9308 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 1 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8628 KB Output is correct
9 Correct 2 ms 8792 KB Output is correct
10 Correct 1 ms 8796 KB Output is correct
11 Correct 2 ms 8792 KB Output is correct
12 Correct 1 ms 8796 KB Output is correct
13 Correct 1 ms 8796 KB Output is correct
14 Correct 2 ms 8792 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 1 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 1 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct
21 Correct 2 ms 8796 KB Output is correct
22 Correct 4 ms 9052 KB Output is correct
23 Correct 4 ms 9052 KB Output is correct
24 Correct 4 ms 9048 KB Output is correct
25 Correct 4 ms 9052 KB Output is correct
26 Correct 4 ms 8932 KB Output is correct
27 Correct 4 ms 9052 KB Output is correct
28 Correct 4 ms 9008 KB Output is correct
29 Correct 4 ms 9052 KB Output is correct
30 Correct 4 ms 9052 KB Output is correct
31 Correct 4 ms 9052 KB Output is correct
32 Correct 4 ms 9052 KB Output is correct
33 Correct 4 ms 9052 KB Output is correct
34 Correct 3 ms 9052 KB Output is correct
35 Correct 3 ms 9052 KB Output is correct
36 Correct 4 ms 9052 KB Output is correct
37 Correct 3 ms 8856 KB Output is correct
38 Correct 5 ms 9308 KB Output is correct
39 Correct 186 ms 33744 KB Output is correct
40 Correct 164 ms 33108 KB Output is correct
41 Correct 166 ms 33744 KB Output is correct
42 Correct 178 ms 34256 KB Output is correct
43 Correct 203 ms 34232 KB Output is correct
44 Correct 200 ms 34128 KB Output is correct
45 Correct 266 ms 39104 KB Output is correct
46 Correct 200 ms 43160 KB Output is correct
47 Correct 159 ms 34696 KB Output is correct
48 Correct 112 ms 34812 KB Output is correct
49 Correct 180 ms 34780 KB Output is correct
50 Correct 134 ms 35076 KB Output is correct
51 Correct 165 ms 42056 KB Output is correct