Submission #895506

#	Time	Username	Problem	Language	Result	Execution time	Memory
895506		Muhammad_Aneeq	Fountain Parks (IOI21_parks)	C++17	0 / 100	3608 ms	1505000 KiB

parks

#include <vector>
#include <map>
#include <queue>
#include <algorithm>
#include "parks.h"
using namespace std;
map<pair<int,int>,int>d,vis;
vector<pair<int,int>>z;
// queue<pair<int,int>>Q;
int x1=0,y11=0;
bool check(int x,int y)
{
	if (d.find({x,y})!=d.end()&&!vis[{x,y}])
	{
		vis[{x,y}]=1;
		z.push_back({d[{x1,y11}],d[{x,y}]});
		return 1;
	}
	return 0;
}
vector<pair<int,int>>i={{0,-2},{0,2},{2,0},{-2,0}};
void bfs(int x,int y)
{
	vis[{x,y}]=1;
	for (int j=0;j<4;j++)
	{
		x1=x;
		y11=y;
		if (check(x+i[j].first,y+i[j].second));
			bfs(x+i[j].first,y+i[j].second);
	}
}
int construct_roads(vector<int> x, vector<int> y)
{
	int n=x.size();
	for (int i=0;i<n;i++)
		d[{x[i],y[i]}]=i;
	int reqx=1e9+10,reqy=1e9+10;
	for (int i=0;i<n;i++)
	{
		if (x[i]<reqx)
		{
			reqx=x[i];
			reqy=y[i];
		}
		else if (x[i]==reqx&&reqy>y[i])
			reqy=y[i];
	}
	sort(begin(i),end(i));
	do
	{
		vis={};
		z={};
		// Q={};
		bfs(reqx,reqy);
		bool w=1;
		for (int i=0;i<n;i++)
		{
			if (!vis[{x[i],y[i]}])
				w=0;
		}
		vis={};
		vector<int>u,v,a,b;
		for (auto i:z)
		{
			u.push_back(i.first);
			v.push_back(i.second);
			pair<int,int>r,q;
			r.first=x[i.first],r.second=y[i.first];
			q.first=x[i.second],q.second=y[i.second];
			if (r.first-q.first==0)
			{
				a.push_back(r.first-1);
				b.push_back((r.second+q.second)/2);
				if (vis[{a.back(),b.back()}])
				{
					a.pop_back();
					a.push_back(r.first+1);
					if (vis[{a.back(),b.back()}])
						w=0;
					vis[{a.back(),b.back()}]=1;
				}
				else
					vis[{a.back(),b.back()}]=1;
			}
			else
			{
				a.push_back((r.first+q.first)/2);
				b.push_back(r.second-1);
				if (vis[{a.back(),b.back()}])
				{
					b.pop_back();
					b.push_back(r.second+1);
					if (vis[{a.back(),b.back()}])
						w=0;
					vis[{a.back(),b.back()}]=1;
				}
				else
					vis[{a.back(),b.back()}]=1;
			}
		}
		if (w==1)
		{
			build(u,v,a,b);
			return 1;
		}
	}
	while(next_permutation(begin(i),end(i)));
	return 0;
}

Compilation message (stderr)

parks.cpp: In function 'void bfs(int, int)':
parks.cpp:29:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   29 |   if (check(x+i[j].first,y+i[j].second));
      |   ^~
parks.cpp:30:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   30 |    bfs(x+i[j].first,y+i[j].second);
      |    ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30