#include <bits/stdc++.h>
using namespace std;
#define int long long
int n, x, y;
bool q(int i, int j){
if(min(i, j) < 1 || max(i, j) > n) return 0;
cout << "examine " << i << ' ' << j << '\n';
string s; cin >> s;
return s == "true";
}
signed main(){
cin >> n >> x >> y;
int x0 = x, x1 = x, y1 = y;
for(int i = 1 << 30; i /= 2){
if(q(x1 + i, y) && q(x1 + i / 2, y) && q(x1 + i / 4, y)) x1 += i;
if(q(x0 - i, y) && q(x0 - i / 2, y) && q(x0 - i / 4, y)) x0 -= i;
if(q(x, y1 + i) && q(x, y1 + i / 2) && q(x, y1 + i / 4)) y1 += i;
}
int w = 2 * (x1 - x0 + 1), y0 = y1 - (x1 - x0);
x = (x0 + x1) / 2;
y = (y0 + y1) / 2;
x0 = x1 = x;
y0 = y1 = y;
while(q(x0 - w, y)) x0 -= w;
while(q(x1 + w, y)) x1 += w;
while(q(x, y0 - w)) y0 -= w;
while(q(x, y1 + w)) y1 += w;
cout << "solution " << (x0 + x1) / 2 << ' ' << (y0 + y1) / 2 << '\n';
}
Compilation message
aliens.cpp: In function 'int main()':
aliens.cpp:17:29: error: expected ';' before ')' token
17 | for(int i = 1 << 30; i /= 2){
| ^
| ;
