Submission #897622

#	Time	Username	Problem	Language	Result	Execution time	Memory
897622		ttamx	Meetings (JOI19_meetings)	C++14	100 / 100	673 ms	1244 KiB

meetings

#include "meetings.h"
#include<bits/stdc++.h>

using namespace std;

void Solve(int n){
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	vector<vector<int>> comp(n);
	for(int i=1;i<n;i++)comp[0].emplace_back(i);
	auto link=[&](int u,int v){
		if(u>v)swap(u,v);
		Bridge(u,v);
	};
	function<void(int)> dnc=[&](int s){
		int sz=comp[s].size();
		if(!sz)return;
		vector<int> res,path{s};
		swap(res,comp[s]);
		int t=res[rng()%sz];
		for(auto u:res)if(u!=t){
			int v=Query(s,t,u);
			if(u==v)path.emplace_back(u);
			else comp[v].emplace_back(u);
		}
		sort(path.begin()+1,path.end(),[&](int l,int r){
			return Query(s,l,r)==l;
		});
		path.emplace_back(t);
		for(int i=1;i<path.size();i++)link(path[i-1],path[i]);
		for(auto u:path)dnc(u);
	};
	dnc(0);
}

Compilation message (stderr)

meetings.cpp: In lambda function:
meetings.cpp:29:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   for(int i=1;i<path.size();i++)link(path[i-1],path[i]);
      |               ~^~~~~~~~~~~~

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