#include "squarerect.h"
#include <bits/stdc++.h>
using namespace std;
bool am_i_square(int N)
{
auto ask = [&](int x, int y){
if(x < 1 || x > N || y < 1 || y > N) return false;
else return inside_shape(x, y);
};
int i, j, a, b, c, d;
a = b = N; c = d = 1;
for(i = 20; i < 100; i += 20){
for(j = 20; j < 100; j += 20){
if(ask(i, j)){
a = min(a, i); b = min(b, j);
c = max(c, i); d = max(d, j);
}
}
}
if(a == N){
for(i = 20; i <= 100; i += 20){
if(ask(i, N)){ a = i; break; }
if(ask(N, i)){ b = i; break; }
}
for(; a != N && ask(a + 1, b); a ++);
for(; b != N && ask(a, b + 1); b ++);
return ask(a - 19, b - 19) && !ask(a - 19, b - 20)
&& !ask(a - 20, b - 19) && !ask(a - 20, b - 20);
}
else{
for(i = 16; i >= 1; i >>= 1){
if(ask(a - i, b)) a -= i;
if(ask(a, b - i)) b -= i;
if(ask(c + i, b)) c += i;
}
return ask(a, c - a + b) && !ask(a, c - a + b + 1);
}
}
Compilation message
/tmp/ccuVYTz2.o: In function `main':
grader.cpp:(.text.startup+0x57): undefined reference to `am_i_square(int, int)'
collect2: error: ld returned 1 exit status
