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Submission #392908

# Submission time Handle Problem Language Result Execution time Memory
392908 2021-04-22T09:24:01 Z wind_reaper Colors (BOI20_colors) C++17
0 / 100
 1 ms 204 KB 
#include <bits/stdc++.h>

using namespace std;


int Ask(int64_t num){
	cout << "? " << num << endl;
	int x;
	cin >> x;
	return x; 
}

int32_t main(){
	ios_base::sync_with_stdio(false); 
	cin.tie(NULL); 
	
	int64_t n;
	cin >> n;

	int64_t l = 1, r = n-1, start = n, cur = 0, dir = 1;

	while(l <= r){
		int64_t mid = (l + r) / 2;
		cur += dir*mid;
		dir *= -1;
		start = min(start, n - cur);
		l = mid + 1;
	}

	l = 1, r = n-1, dir = 1;

	int64_t answer = n-1;

	Ask(start);

	while(l <= r){
		int64_t mid = (l + r) / 2;
		int64_t ask = start + dir*mid;
		dir *= -1;
		if(Ask(ask)){
			answer = mid;
			r = mid - 1;
		}
		else l = mid + 1;
		start = ask;
	}
	
	cout << "= " << answer << '\n';	
	return 0; 
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Correct 1 ms 200 KB OK (7 queries)
3 Correct 1 ms 200 KB OK (4 queries)
4 Correct 1 ms 200 KB OK (5 queries)
5 Correct 1 ms 200 KB OK (5 queries)
6 Correct 1 ms 200 KB OK (7 queries)
7 Correct 1 ms 200 KB OK (7 queries)
8 Correct 1 ms 200 KB OK (6 queries)
9 Correct 1 ms 204 KB OK (7 queries)
10 Correct 1 ms 200 KB OK (4 queries)
11 Correct 1 ms 200 KB OK (5 queries)
12 Correct 1 ms 200 KB OK (6 queries)
13 Correct 1 ms 200 KB OK (7 queries)
14 Correct 1 ms 200 KB OK (7 queries)
15 Correct 1 ms 200 KB OK (7 queries)
16 Correct 1 ms 200 KB OK (7 queries)
17 Incorrect 1 ms 200 KB Wrong guess
18 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Correct 1 ms 200 KB OK (7 queries)
3 Correct 1 ms 200 KB OK (4 queries)
4 Correct 1 ms 200 KB OK (5 queries)
5 Correct 1 ms 200 KB OK (5 queries)
6 Correct 1 ms 200 KB OK (7 queries)
7 Correct 1 ms 200 KB OK (7 queries)
8 Correct 1 ms 200 KB OK (6 queries)
9 Correct 1 ms 204 KB OK (7 queries)
10 Correct 1 ms 200 KB OK (4 queries)
11 Correct 1 ms 200 KB OK (5 queries)
12 Correct 1 ms 200 KB OK (6 queries)
13 Correct 1 ms 200 KB OK (7 queries)
14 Correct 1 ms 200 KB OK (7 queries)
15 Correct 1 ms 200 KB OK (7 queries)
16 Correct 1 ms 200 KB OK (7 queries)
17 Incorrect 1 ms 200 KB Wrong guess
18 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Correct 1 ms 200 KB OK (7 queries)
3 Correct 1 ms 200 KB OK (4 queries)
4 Correct 1 ms 200 KB OK (5 queries)
5 Correct 1 ms 200 KB OK (5 queries)
6 Correct 1 ms 200 KB OK (7 queries)
7 Correct 1 ms 200 KB OK (7 queries)
8 Correct 1 ms 200 KB OK (6 queries)
9 Correct 1 ms 204 KB OK (7 queries)
10 Correct 1 ms 200 KB OK (4 queries)
11 Correct 1 ms 200 KB OK (5 queries)
12 Correct 1 ms 200 KB OK (6 queries)
13 Correct 1 ms 200 KB OK (7 queries)
14 Correct 1 ms 200 KB OK (7 queries)
15 Correct 1 ms 200 KB OK (7 queries)
16 Correct 1 ms 200 KB OK (7 queries)
17 Incorrect 1 ms 200 KB Wrong guess
18 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Correct 1 ms 200 KB OK (7 queries)
3 Correct 1 ms 200 KB OK (4 queries)
4 Correct 1 ms 200 KB OK (5 queries)
5 Correct 1 ms 200 KB OK (5 queries)
6 Correct 1 ms 200 KB OK (7 queries)
7 Correct 1 ms 200 KB OK (7 queries)
8 Correct 1 ms 200 KB OK (6 queries)
9 Correct 1 ms 204 KB OK (7 queries)
10 Correct 1 ms 200 KB OK (4 queries)
11 Correct 1 ms 200 KB OK (5 queries)
12 Correct 1 ms 200 KB OK (6 queries)
13 Correct 1 ms 200 KB OK (7 queries)
14 Correct 1 ms 200 KB OK (7 queries)
15 Correct 1 ms 200 KB OK (7 queries)
16 Correct 1 ms 200 KB OK (7 queries)
17 Incorrect 1 ms 200 KB Wrong guess
18 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Correct 1 ms 200 KB OK (7 queries)
3 Correct 1 ms 200 KB OK (4 queries)
4 Correct 1 ms 200 KB OK (5 queries)
5 Correct 1 ms 200 KB OK (5 queries)
6 Correct 1 ms 200 KB OK (7 queries)
7 Correct 1 ms 200 KB OK (7 queries)
8 Correct 1 ms 200 KB OK (6 queries)
9 Correct 1 ms 204 KB OK (7 queries)
10 Correct 1 ms 200 KB OK (4 queries)
11 Correct 1 ms 200 KB OK (5 queries)
12 Correct 1 ms 200 KB OK (6 queries)
13 Correct 1 ms 200 KB OK (7 queries)
14 Correct 1 ms 200 KB OK (7 queries)
15 Correct 1 ms 200 KB OK (7 queries)
16 Correct 1 ms 200 KB OK (7 queries)
17 Incorrect 1 ms 200 KB Wrong guess
18 Halted 0 ms 0 KB -