Submission #579323

#	Time	Username	Problem	Language	Result	Execution time	Memory
579323		OttoTheDino	Meetings (JOI19_meetings)	C++17	100 / 100	1050 ms	980 KiB

meetings

#include "meetings.h"

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

#define rep(i,s,e)                          for (int i = s; i <= e; ++i)
#define fi                                  first
#define se                                  second
#define all(a)                              a.begin(), a.end()
#define len(a)                              (int)a.size()
#define pb                                  push_back
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;

const int mx = 2000;
vi kids[mx];
int sz[mx], par[mx], done[mx];

int bot (int u, int id) {
    vii ord;
    for (int v : kids[u]) ord.pb({sz[v],v});
    sort(all(ord));
    reverse(all(ord));
    if (id >= len(ord)) return u;
    return bot (ord[id].se, 0);
}

void upd (int u) {
    sz[u]++;
    if (par[u]) upd(par[u]);
}

void Solve(int n) {

    done[0] = 1;

    rep (i,1,n-1) {

        if (done[i]) continue;

        int cur = 0, id = 0, y = i, x = -1;

        while (true) {
            x = bot(cur, id);

            if (x==cur) break;

            int res = Query (0, i, x); 

            if (!done[res]) {
                if (res!=i) { 
                    par[i] = res;
                    kids[res].pb(i);
                    y = res;
                }
                break;
            }
            
            if (res!=cur) {
                cur = res;
                id = 0;
            }

            else id++;
        }
        vi a;
        while (x!=0) {
            a.pb(x);
            x = par[x];
        }
        a.pb(0);


        int lo = 0, hi = len(a)-1;
        while (lo<hi) {
            int mid = (lo+hi)/2;

            int res = Query (0, a[mid], y);

            if (res==y) lo = mid+1;
            else hi = mid;
        }

        par[y] = a[lo];
        kids[a[lo]].pb(y);

        if (lo != 0) {
            par[a[lo-1]] = y;
            kids[a[lo]].erase(find(all(kids[a[lo]]),a[lo-1]));
            kids[y].pb(a[lo-1]);
       }

        upd(i);
        if (y!=i) upd (y);
        done[i] = done[y] = 1;
    }

    rep (i,1,n-1) Bridge(min(par[i],i), max(i,par[i]));
}

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71