Submission #164432

#	Time	Username	Problem	Language	Result	Execution time	Memory
164432		tneluccus	Meetings (JOI19_meetings)	C++14	100 / 100	1578 ms	1016 KiB

meetings

#include<bits/stdc++.h>
#include "meetings.h"
using namespace std;
const int num=2e3+2;
vector<int> lis[num];
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//void Bridge(int x,int y){
//	cout<<x<<' '<<y<<" yahyah"<<endl;
//}
//int Query(int x,int y,int z){
//	cout<<x<<' '<<y<<' '<<z<<endl;
//	int t;
//	cin>>t;
//	return t;
//}
void solve1(int root){
	int n=lis[root].size(),i,j,ran,ver;
	if(!n){
		return;
	}
	vector<int> idx;
	vector<int> cac=lis[root];
	lis[root].clear();
	ran=rng()%n;
//	ran=n-1;
	ver=cac[ran];
	idx.push_back(root);
	idx.push_back(ver);
	for(i=0;i<n;i++){
		if(i==ran){
			continue;
		}
		j=Query(root,ver,cac[i]);
		if(j==lis[root][i]){
			idx.push_back(j);
		}
		else{
			lis[j].push_back(cac[i]);
		}
	}
	sort(idx.begin(),idx.end(),[&](int x,int y){		//x is before y
		if(x==root){
			return true;
		}
		if(y==root){
			return false;
		}
		return Query(root,x,y)==x;
	});
//	cout<<"lon"<<endl;
//	for(i=0;i<idx.size();i++){
//		cout<<idx[i]<<' ';
//	}
//	cout<<"cac"<<endl;
	for(i=1;i<idx.size();i++){
		Bridge(min(idx[i-1],idx[i]),max(idx[i],idx[i-1]));
	}
	for(i=0;i<idx.size();i++){
		solve1(idx[i]);
	}
}
void Solve(int N){
	int n=N,i,root=rng()%N;
//	root=0;
	for(i=0;i<n;i++){
		if(i==root){
			continue;
		}
		lis[root].push_back(i);
	}
	solve1(root);
}
//int main(){
//	Solve(10);
//}

Compilation message (stderr)

meetings.cpp: In function 'void solve1(int)':
meetings.cpp:55:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=1;i<idx.size();i++){
          ~^~~~~~~~~~~
meetings.cpp:58:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<idx.size();i++){
          ~^~~~~~~~~~~

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