Submission #210162

#	Time	Username	Problem	Language	Result	Execution time	Memory
210162		achibasadzishvili	Meetings (JOI19_meetings)	C++17	100 / 100	621 ms	1016 KiB

meetings

#include "meetings.h"
#include<bits/stdc++.h>
#define pb push_back
// Query(a , b , c);
// Bridge(x , y)
using namespace std;
int root,fix[2005];
vector<int>g[2005];
bool xD(int a,int b){
    int p = Query(root , a , b);
    if(a == p)return 1;
    return 0;
}
void bridge(int x,int y){
    if(y < x)swap(x , y);
    Bridge(x , y);
}
void rec(vector<int>v){
    int n = (int)v.size();
    if(n == 1)return;
    random_shuffle(v.begin() , v.end());
    root = v[0];
    int x = v[1];
    if(n == 2){
        bridge(root , x);
        return;
    }
    vector<int>t;
    for(int i=0; i<n; i++){
        fix[v[i]] = 0;
        g[v[i]].clear();
    }
    
    g[x].pb(x);
    g[root].pb(root);
    fix[root] = 1;
    for(int i=2; i<n; i++){
        int k = Query(root , x , v[i]);
        if(!fix[k])t.pb(k);
        g[k].pb(v[i]);
        fix[k] = 1;
    }
    if(!fix[x])t.pb(x);
    sort(t.begin() , t.end() , xD);
    bridge(root , t[0]);
    for(int i=1; i<t.size(); i++)bridge(t[i - 1] , t[i]);
    rec(g[root]);
    for(int i=0; i<t.size(); i++)
        rec(g[t[i]]);
}
void Solve(int N){
    vector<int>gg;
    for(int i=0; i<N; i++)
        gg.pb(i);
    rec(gg);
}

Compilation message (stderr)

meetings.cpp: In function 'void rec(std::vector<int>)':
meetings.cpp:46:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1; i<t.size(); i++)bridge(t[i - 1] , t[i]);
                  ~^~~~~~~~~
meetings.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<t.size(); i++)
                  ~^~~~~~~~~

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