Submission #952241

#	Time	Username	Problem	Language	Result	Execution time	Memory
952241		GrindMachine	Meetings 2 (JOI21_meetings2)	C++17	0 / 100	7 ms	19260 KiB

meetings2

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<ll> adj[N];
vector<ll> subsiz(N), depth(N);

void dfs1(ll u, ll p){
    subsiz[u] = 1;
    trav(v,adj[u]){
        if(v == p) conts;
        depth[v] = depth[u]+1;
        dfs1(v,u);
        subsiz[u] += subsiz[v];
    }
}

map<ll,ll> mp[N];
vector<ll> ans(N);

void dfs2(ll u, ll p){
    pll best = {-1,-1};
    trav(v,adj[u]){
        if(v == p) conts;
        pll px = {subsiz[v],v};
        amax(best,px);
    }

    ll heavy = best.ss;
    if(heavy == -1){
        mp[u][subsiz[u]] = depth[u];
        return;
    }

    dfs2(heavy,u);
    swap(mp[u],mp[heavy]);

    trav(v,adj[u]){
        if(v == p or v == heavy) conts;
        dfs2(v,u);

        for(auto [x,d1] : mp[v]){
            // x <= y
            auto it = mp[u].lower_bound(x);
            if(it != mp[u].end()){
                auto [y,d2] = *it;
                amax(ans[x],d1+d2-2*depth[u]);
            }

            // x > y
            if(it != mp[u].begin()){
                it--;
                auto [y,d2] = *it;
                amax(ans[y],d1+d2-2*depth[u]);
            }
        }

        for(auto [x,d] : mp[v]){
            auto it = mp[u].lower_bound(x);
            if(it != mp[u].end() and it->second >= d) conts;
            mp[u][x] = d;
            it = mp[u].find(x);
            vector<ll> torem;

            while(it != mp[u].begin()){
                it--;
                if(it->second > d) break;
                torem.pb(it->first);
            }

            trav(y,torem){
                mp[u].erase(y);
            }
        }
    }

    {
        ll x = subsiz[u], d = depth[u];
        auto it = mp[u].lower_bound(x);
        if(!(it != mp[u].end() and it->second >= d)){ 
            mp[u][x] = d;
            it = mp[u].find(x);
            vector<ll> torem;

            while(it != mp[u].begin()){
                it--;
                if(it->second > d) break;
                torem.pb(it->first);
            }

            trav(y,torem){
                mp[u].erase(y);
            }
        }
    }

    {
        ll mx = subsiz[1]-subsiz[u];
        auto it = mp[u].lower_bound(mx);
        if(it != mp[u].end()){
            auto [x,d] = *it;
            amax(ans[mx],d-depth[u]+1);
        }
    }
}

vector<pll> ances;

void dfs3(ll u, ll p){
    ances.pb({subsiz[1]-subsiz[u],u});
    auto it = upper_bound(all(ances),make_pair(subsiz[u],-1ll));
    if(it != ances.end()){
        ll v = it->second;
        amax(ans[subsiz[u]],depth[u]-depth[v]+1);
    }

    trav(v,adj[u]){
        if(v == p) conts;
        dfs3(v,u);
    }

    ances.pop_back();
}

void solve(int test_case)
{
    ll n; cin >> n;
    rep1(i,n-1){
        ll u,v; cin >> u >> v;
        adj[u].pb(v), adj[v].pb(u);
    }

    dfs1(1,-1);
    dfs2(1,-1);
    dfs3(1,-1);

    rev(i,n,1) amax(ans[i],ans[i+1]);

    rep1(i,n){
        if(i&1) cout << 1 << endl;
        else cout << ans[i/2]+1 << endl;
    }
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

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