Submission #854210

#	Time	Username	Problem	Language	Result	Execution time	Memory
854210		Trisanu_Das	Colors (BOI20_colors)	C++17	Compilation error	0 ms	0 KiB

Colors

#include <bits/stdc++.h>
using namespace std;
#define int long long
 
bool query(int i) {
	cout << "? " << i << '\n';
	cin >> i;
	return i;
}
 
int main() {
	int N; cin >> N;
	int i = 0, c = 0, l = 1, r = N, d = -1;
	for(; l < r; d = -d) {
		l = (l + r - 1) >> 1;
		i = max(i, int(1) - (c += d * l++));
	}
	query(i);
	l = 1, r = N, d = -1;
	for(; l < r; d = -d) {
		ll m = (l + r - 1) >> 1;
		if(query(i += d * m)) r = m;
		else l = m + 1;
	}
	cout << "= " << l << '\n';
}

Compilation message (stderr)

cc1plus: error: '::main' must return 'int'
Colors.cpp: In function 'int main()':
Colors.cpp:3:13: error: expected primary-expression before 'long'
    3 | #define int long long
      |             ^~~~
Colors.cpp:16:14: note: in expansion of macro 'int'
   16 |   i = max(i, int(1) - (c += d * l++));
      |              ^~~
Colors.cpp:21:3: error: 'll' was not declared in this scope; did you mean 'l'?
   21 |   ll m = (l + r - 1) >> 1;
      |   ^~
      |   l
Colors.cpp:22:21: error: 'm' was not declared in this scope
   22 |   if(query(i += d * m)) r = m;
      |                     ^
Colors.cpp:13:13: warning: unused variable 'c' [-Wunused-variable]
   13 |  int i = 0, c = 0, l = 1, r = N, d = -1;
      |             ^