Submission #238722

#	Time	Username	Problem	Language	Result	Execution time	Memory
238722		b00n0rp	Meetings (JOI19_meetings)	C++17	100 / 100	1156 ms	1016 KiB

meetings

#include <bits/stdc++.h>
#include "meetings.h"
using namespace std;
 
typedef long double LD;
typedef long long ll;
#define pb push_back
#define REP(i,n) for (int i = 0; i < n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define all(v) v.begin(),v.end()
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
#define F first
#define S second
 
vi gg[2005];
vpii edges;

int globalu;

bool cmp(int x,int y){
	return Query(globalu,x,y) == x;
}

void dfs(int u){
	vi mkc;
	for(auto x:gg[u]) mkc.pb(x);
	gg[u].clear();
	if(mkc.size() == 0) return;
	if(mkc.size() == 1){
		edges.pb({u,mkc[0]});
		return;
	}
	int v = mkc[rand()%mkc.size()];
	vi path;
	for(auto x:mkc){
		if(x == v) continue;
		int lol = Query(u,v,x);
		if(lol == x) path.pb(x);
		else gg[lol].pb(x);
	}
	path.pb(v);
	globalu = u;
	sort(all(path),cmp);
	edges.pb({u,path[0]});
	REP(i,path.size()-1) edges.pb({path[i],path[i+1]});
	dfs(u);
	for(auto x:path) dfs(x);
}

void Solve(int n){
	int root = rand()%n;
	REP(i,n){
		if(i != root){
			gg[root].pb(i);
		}
	}
	dfs(root);
	for(auto x:edges){
		Bridge(min(x.F,x.S),max(x.F,x.S));
	}
}

Compilation message (stderr)

meetings.cpp: In function 'void dfs(int)':
meetings.cpp:8:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define REP(i,n) for (int i = 0; i < n; i++)
meetings.cpp:48:6:
  REP(i,path.size()-1) edges.pb({path[i],path[i+1]});
      ~~~~~~~~~~~~~~~                
meetings.cpp:48:2: note: in expansion of macro 'REP'
  REP(i,path.size()-1) edges.pb({path[i],path[i+1]});
  ^~~

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