Submission #852962

#	Time	Username	Problem	Language	Result	Execution time	Memory
852962		danikoynov	Meetings 2 (JOI21_meetings2)	C++14	0 / 100	4 ms	17756 KiB

meetings2

/**
 ____ ____ ____ ____ ____ ____
||l |||e |||i |||n |||a |||d ||
||__|||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|/__\|

**/

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 2e5 + 10;

int n;
vector < int > adj[maxn];
int order[maxn], tin[maxn], tout[maxn];
int timer, depth[maxn], sub[maxn];

void euler(int v, int p)
{
    order[++ timer] = v;
    tin[v] = timer;

    sub[v] = 1;
    for (int u : adj[v])
    {
        if (u == p)
            continue;
        depth[u] = depth[v] + 1;
        euler(u, v);
        sub[v] += sub[u];
    }

    tout[v] = timer;
}

vector < int > path;
int max_chain[maxn], virtual_sub[maxn];
set < pair < int, int > > act[maxn];

void dfs(int v, int p)
{

    for (int u : adj[v])
    {
        if (u == p)
            continue;

        dfs(u, v);


        for (pair < int, int > cur : act[v])
        {
            set < pair < int, int > > :: iterator it = act[u].lower_bound(cur);
            if (it != act[u].end())
            {
                int id = cur.first * 2;

                max_chain[id] = max(max_chain[id], cur.second + it -> second - 2 * depth[v]);
            }
        }

        for (pair < int, int > cur : act[u])
        {
            set < pair < int, int > > :: iterator it = act[v].lower_bound(cur);
            if (it != act[v].end())
            {

                int id = cur.first * 2;

                ///cout << "here " << v << " " << id << " " << cur.first << " " << cur.second << endl;
                max_chain[id] = max(max_chain[id], cur.second + it -> second - 2 * depth[v]);
            }

            int vir_sub = n - sub[u];
            int id = 2 * min(vir_sub, cur.first);
            max_chain[id] = max(max_chain[id], cur.second - depth[v]);
        }

    for (pair < int, int > cur1 : act[v])
        for (pair < int, int > cur2 : act[u])
    {
        int id = 2 * min(cur1.first, cur2.first);
        max_chain[id] = max(max_chain[id], cur1.second + cur2.second - 2 * depth[v]);
    }
        for (pair < int, int > cur : act[u])
        {
            set < pair < int, int > > :: iterator it = act[v].lower_bound(cur);
            if (it != act[v].end() && it -> second >= cur.second)
                continue;
            act[v].insert(cur);
            while(true)
            {
                it = act[v].find(cur);
                if (it == act[v].begin())
                    break;
                it = prev(it);
                if (it -> second <= cur.second)
                    act[v].erase(it);
                else
                    break;
            }
        }
    }


    pair < int, int > cur = {sub[v], depth[v]};
    set < pair < int, int > > :: iterator it = act[v].lower_bound(cur);
    if (it != act[v].end() && it -> second >= cur.second)
        return;
    act[v].insert(cur);
    while(true)
    {
        it = act[v].find(cur);
        if (it == act[v].begin())
            break;
        it = prev(it);
        if (it -> second <= cur.second)
            act[v].erase(it);
        else
            break;
    }

    /**cout << "step " << v << endl;
    for (pair < int, int > cur : act[v])
        cout << cur.first << " : " << cur.second << endl;*/

}
void solve()
{
    cin >> n;
    for (int i = 1; i < n; i ++)
    {
        int v, u;
        cin >> v >> u;
        adj[v].push_back(u);
        adj[u].push_back(v);
    }

    euler(1, 0);
    for (int i = 1; i <= n; i ++)
    {
        max_chain[i] = -1;
    }

    dfs(1, 0);
    for (int i = 1; i <= n; i ++)
    {
        if (i % 2 == 1)
            cout << 1 << endl;
        else
            cout << max_chain[i] + 1 << endl;
    }
}

int main()
{
    speed();
    solve();
    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 16
• Subtask 3: 0 / 80