Submission #890368

#	Time	Username	Problem	Language	Result	Execution time	Memory
890368		Muhammad_Aneeq	Aliens (IOI07_aliens)	C++17	0 / 100	2 ms	940 KiB

aliens

#include <iostream>
#include <map>
#include <vector>
#include <algorithm>
using namespace std;
int N,M;
map<pair<int,int>,bool>vis;
map<pair<int,int>,string>res;
int r=0;
string check(int x,int y)
{
	if (res[{x,y}]=="true"||res[{x,y}]=="false")
		return res[{x,y}];
	cout<<"examine "<<x<<' '<<y<<endl;
	r++;
	string z;
	cin>>z;
	res[{x,y}]=z;
	return z;
}
vector<pair<int,int>>ind;
void dfs(int x,int y)
{
	if (x>N||y>N)
		return;
	if (vis[{x,y}])
		return;
	vis[{x,y}]=1;
	string z=check(x,y);
	if (z=="true")
	{
		ind.push_back({x,y});
		dfs(x,y+1);
		dfs(x,y-1);
	}
}
void dfs1(int x,int y)
{
	if (x>N||y>N||x<=0||y<=0)
		return;
	if (vis[{x,y}])
		return;
	vis[{x,y}]=1;
	if (check(x,y)=="true")
	{
		ind.push_back({x,y});
		dfs1(x+2*M,y);dfs1(x-2*M,y);dfs1(x,y+2*M);dfs1(x,y-2*M);
	}
}
inline void solve()
{
	int x,y;
	cin>>N>>x>>y;
	vis={};
	res={};
	ind.push_back({x,y});
	res[{x,y}]="true";
	vis[{x,y}]=1;
	dfs(x,y+1);
	dfs(x,y-1);
	sort(begin(ind),end(ind));
	M=ind.size();
	x=ind[M/2].first,y=ind[M/2].second;
	int st=-(M/2)-1,en=M/2+1;
	while (st+1<en)
	{
		int mid=(st+en)/2;
		if (check(x+mid+(M/2),y)=="false")
			en=mid;
		else
			st=mid;
	}
	ind={};
	vis={};
	ind.push_back({x+st,y});
	dfs1(x+st,y);
	sort(begin(ind),end(ind));
	cout<<"solution ";
	cout<<ind[5].first<<' '<<ind[5].second<<endl;
}
int main()
{
	solve();
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
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• Subtask 10: 0 / 10