Submission #507947

#	Time	Username	Problem	Language	Result	Execution time	Memory
507947		ac2hu	Aliens (IOI07_aliens)	C++14	0 / 100	3 ms	220 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
#define int long long 
const int M = 31623;
const int N = 2'000'000'000;
bool check(int i,int j,int n){
	if(i >0 && j >0 && i <= n && j <= n){
		cout << "examine " << i << " " << j << endl;
		string s;cin >> s;
		fflush(stdout);
		return ((s == "true")? true : false);
	}
	return 0;
}
signed main(){
	int n,x,y;cin >> n >> x >> y;
	int rx = x;
	for( ;rx<=n;rx++){
		if(!check(rx,y,n)){
			break;
		}
	}
	rx--;
	int ry = y;
	for(;ry<=n;ry++)
		if(!check(rx,ry,n))
			break;
	ry--;
	int l = 0,r = n - max(rx,ry);
	while(l < r){
		int mid = (l + r + 1)/2;
		if(check(rx + mid, ry + mid,n))
			l = mid;
		else 
			r = mid - 1;
	}
	pair<int,int> topcorner = {rx + l, ry + l};
	l = 0,r = min(rx,ry) - 1;
	while(l < r){
		int mid = (l + r + 1)/2;
		if(check(rx - mid,ry - mid, n))
			l = mid;
		else 
			r = mid - 1;
	}
	pair<int,int> bottomcorner = {rx - l,ry - l};
	pair<int,int> center = {(topcorner.first + bottomcorner.first)/2,(topcorner.second + bottomcorner.second)/2};
	cout << "solution " << center.first << " " << center.second << "\n";
}

• 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
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10