Submission #122273

#	Time	Username	Problem	Language	Result	Execution time	Memory
122273		khulegub	Aliens (IOI07_aliens)	C++14	100 / 100	4 ms	512 KiB

aliens

#include<bits/stdc++.h>
#define unen true
#define hud false
using namespace std;
typedef long long i64;
 
i64 n;
 
i64 read_int(){
	char r;
	bool start=false,neg=false;
	i64 ret=0;
	while(true){
		r = getchar();
		if((r-'0'<0 || r-'0'>9) && r!='-' && !start){
			continue;
		}
		if((r-'0'<0 || r-'0'>9) && r!='-' && start){
			break;
		}
		if(start) ret *= 10;
		start = true;
		if(r=='-') neg = true;
		else ret+=r-'0';
	}
	if(!neg)
		return ret;
	else
		return -ret;
}
bool exam(i64 x, i64 y){
	if(x < 1 || y < 1 || x > n || y > n) return 0;
	cout << "examine " << x << ' ' << y << endl;
	string ans;
	cin >> ans;
	return (ans[0] == 't');
}
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	i64 X, Y, x0, y0; // X, Y - chigluulegch
	i64 zuun, baruun, deesh, doosh;
	i64 usreh, l, r, m;
	n = read_int();
	x0 = read_int();
	y0 = read_int();
	// cin >> n >> x0 >> y0;
 
	X = -1, Y = 0;
	usreh = 1;
	while( exam(x0 + X * usreh, y0 + Y * usreh) ){
		usreh = usreh << 1;
	}
	l = usreh / 2, r = usreh;
	while( l + 1 < r ){
		i64 mid = (l + r) >> 1;
		if( exam(x0 + X * mid, y0 + Y * mid) ) l = mid;
		else r = mid;
	}
	zuun = l;
	//
	X = 1, Y = 0;
	usreh = 1;
	while( exam(x0 + X * usreh, y0 + Y * usreh) ){
		usreh = usreh << 1;
	}
	l = usreh / 2, r = usreh;
	while( l + 1< r ){
		i64 mid = (l + r) >> 1;
		if( exam(x0 + X * mid, y0 + Y * mid) ) l = mid;
		else r = mid;
	}
	baruun = l;
	//
	X = 0, Y = -1;
	usreh = 1;
	while( exam(x0 + X * usreh, y0 + Y * usreh) ){
		usreh = usreh << 1;
	}
	l = usreh / 2, r = usreh;
	while( l + 1 < r ){
		i64 mid = (l + r) >> 1;
		if( exam(x0 + X * mid, y0 + Y * mid) ) l = mid;
		else r = mid;
	}
	doosh = l;
	//
	X = 0, Y = 1;
	usreh = 1;
	while( exam(x0 + X * usreh, y0 + Y * usreh) ){
		usreh = usreh << 1;
	}
	l = usreh / 2, r = usreh;
	while( l + 1 < r ){
		i64 mid = (l + r) >> 1;
		if( exam(x0 + X * mid, y0 + Y * mid) ) l = mid;
		else r = mid;
	}
	deesh = l;
	//
	m = deesh + doosh + 1;
	x0 = x0 - zuun + (m / 2); //centering
	y0 = y0 - doosh + (m / 2);
	//wtf ene yu yum be sd
	while( exam(x0 - m, y0 - m) ) x0 -= m, y0 -= m;
	while( exam(x0 - 2 * m, y0) ) x0 -= 2 * m;
	while( exam(x0, y0 - 2 * m) ) y0 -= 2 * m;
 
    cout << "solution " << x0 + 2 * m << ' ' << y0 + 2 * m << endl;
	return 0;
}

Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:41:12: warning: variable 'baruun' set but not used [-Wunused-but-set-variable]
  i64 zuun, baruun, deesh, doosh;
            ^~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10