#include <bits/stdc++.h>
using namespace std;
#define finish(x) return cout << x << endl, 0
#define ll long long
int n, x, y;
bool ask(int row, int col){
if(row < 1 || row > n || col < 1 || col > n) return 0;
return grid[row][col];
cout << "examine " << row << " " << col << endl;
string ret;
cin >> ret;
return ret == "true";
}
void answer(int row, int col){
cout << "solution " << row << " " << col << endl;
}
int findup(int row, int col){
int l = 1, r = row;
while(l <= r){
int mid = (l + r) / 2;
if(ask(mid, col)) r = mid - 1;
else l = mid + 1;
}
return l;
}
int findleft(int row, int col){
int l = 1, r = col;
while(l <= r){
int mid = (l + r) / 2;
if(ask(row, mid)) r = mid - 1;
else l = mid + 1;
}
return l;
}
int finddown(int row, int col){
int l = row, r = n;
while(l <= r){
int mid = (l + r) / 2;
if(ask(mid, col)) l = mid + 1;
else r = mid - 1;
}
return r;
}
int check(int m, int x, int y){
int ret = 0;
for(int i = -5 ; i <= 5 ; i++){
for(int j = -5 ; j <= 5 ; j++){
ret += ask(x + i * m, y + j * m);
}
}
return ret == 13;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> x >> y;
while(ask(x + 1, y)) x = finddown(x, y);
int h = findup(x, y);
int m = x - h + 1;
x = h;
if(m % 3 == 0 && check(m / 3, x, y)) m /= 3;
else if(m % 5 == 0 && check(m / 5, x, y)) m /= 5;
y = findleft(x, y);
for(int i = -5 ; i <= 5 ; i++){
for(int j = -5 ; j <= 5 ; j++){
if(ask(x + i * m, y + j * m)){
x += i * m;
y += j * m;
i = 6;
break;
}
}
}
answer(x + 2 * m + m / 2, y + 2 * m + m / 2);
}
Compilation message
aliens.cpp: In function 'bool ask(int, int)':
aliens.cpp:10:12: error: 'grid' was not declared in this scope
return grid[row][col];
^~~~
aliens.cpp:10:12: note: suggested alternative: 'void'
return grid[row][col];
^~~~
void