Submission #1171240

#	Time	Username	Problem	Language	Result	Execution time	Memory
1171240		Zbyszek99	Meetings (JOI19_meetings)	C++20	100 / 100	613 ms	1524 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

vi sort_path(vi p, int start_path, int end_path)
{
    if(siz(p) == 0)
    {
        return {start_path,end_path};
    }
    if(siz(p) == 1)
    {
        return {start_path,p[0],end_path};
    }
    int ind = los(0,siz(p)-1);
    int v = p[ind];
    vi p_left;
    vi p_right;
    forall(it,p)
    {
        if(it == v) continue;
        int ans = Query(start_path,it,v);
        if(ans == it) p_left.pb(it);
        else p_right.pb(it);
    }
   // cout << " path\n";
    vi v1 = sort_path(p_left,start_path,v);
    vi v2 = sort_path(p_right,v,end_path);
    rep2(i,1,siz(v2)-1) v1.pb(v2[i]);
    return v1;
}

void solve(vi vert)
{
   // forall(it,vert)
   // {
   //     cout << it << " ";
   // }
   // cout << " verts\n";
    if(siz(vert) <= 1) return;
    int root = vert[los(0,siz(vert)-1)];
    int end_path = vert[los(0,siz(vert)-1)];
    while(root == end_path)
    {
        end_path = vert[los(0,siz(vert)-1)];
    }
    vi odp(siz(vert));
    vi path = {};
    unordered_map<int,int> mapa;
    rep(i,siz(vert))
    {
        mapa[vert[i]] = i;
    }
    rep(i,siz(vert))
    {
        if(vert[i] != root && vert[i] != end_path)
        {
            int a = Query(root,end_path,vert[i]);
            odp[i] = mapa[a];
            if(a == vert[i])
            {
                path.pb(vert[i]);
            }
        }
        else
        {
      //      cout << i << " " << mapa[i] << " xd\n";
            odp[i] = i;
        }
    }
   // forall(it,path)
   // {
   //     cout << it << " ";
   // }
   // cout << " path\n";
    path = sort_path(path,root,end_path);
   // forall(it,path)
   // {
   //     cout << it << " ";
   // }
   // cout << " path\n";
    rep(i,siz(path)-1)
    {
    //    cout << path[i] << " " << path[i+1] << " edge\n";
        Bridge(min(path[i],path[i+1]),max(path[i],path[i+1]));
    }
    vector<vi> group(siz(vert));
    rep(i,siz(vert))
    {
       // cout << i << " " << odp[i] << " odp\n";
        group[odp[i]].pb(vert[i]);
    }
    forall(it,group) solve(it);
}

void Solve(int n) 
{
    random_start();
    vi vert;
    rep(i,n) vert.pb(i);
    solve(vert);
}

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