Submission #1298505

#	Time	Username	Problem	Language	Result	Execution time	Memory
1298505		flo	Guess the number (BOI20_guess)	C++20	0 / 100	0 ms	332 KiB

Guess

#include <bits/stdc++.h>
#define task "testing"
#define ll long long
#define multitest 0
using namespace std;

int ask(int x) {
	cout << "? " << x << "\n";
	
	int res; cin >> res;
	
	return res;
}

void guess(int x) {
	cout << "= " << x << "\n";
}

void flo(int ID) {
	int l = 1, r; cin >> r;
	
	while (l <= r) {
		int mid = (l+r)/2;
		
		int res = ask(mid);
		
		if (res == 1) {
			l = mid+1;
		}
		if (res == 0) {
			guess(mid);
			
			return;
		}
		if (res == -1) {
			r = mid-1;
		}
	}
}

int main() {
//	ios_base::sync_with_stdio(0);
//	cin.tie(0); cout.tie(0);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

	int TCS = 1, ID = 1;

	if (multitest) {
		cin >> TCS;
	}

	while (TCS--) flo(ID++);

	return 0;
}

Compilation message (stderr)

Guess.cpp: In function 'int main()':
Guess.cpp:46:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |                 freopen(task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Guess.cpp:47:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |                 freopen(task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 29
• Subtask 2: 0 / 71