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Submission #484709

# Submission time Handle Problem Language Result Execution time Memory
484709 2021-11-05T08:10:55 Z ac2hu Colors (BOI20_colors) C++14
0 / 100
 1 ms 200 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
map<ll,bool> used;
ll n;
bool good(ll mid, ll &cur){
	if(cur + mid <= n && !used[cur + mid]){
		cur += mid;
		used[cur] = true;
		cout << "? " << cur << endl;
		bool a;cin >> a;
		return a;
	}
	else if(cur - mid > 0 && !used[cur - mid]){
		cur -= mid;
		used[cur] = true;
		cout << "? " << cur << endl;
		bool a;cin >> a;
		return a;
	}
	cout << "= " << 1e9 << endl;
	return false;
}
signed main(){
	cin >> n;
	ll cur = 0;
	good(1,cur);
	ll l = 1,r = n;
	while(l < r){
		ll mid = (l + r)/2;
		if(good(mid,cur)){
			r = mid;
		}
		else{
			l = mid + 1;
		}
	}
	cout << "= "<< l << endl;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB OK (4 queries)
2 Incorrect 1 ms 200 KB Expected integer, but "1e+09" found
3 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 Incorrect 1 ms 200 KB Expected integer, but "1e+09" found
3 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 Incorrect 1 ms 200 KB Expected integer, but "1e+09" found
3 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 Incorrect 1 ms 200 KB Expected integer, but "1e+09" found
3 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 Incorrect 1 ms 200 KB Expected integer, but "1e+09" found
3 Halted 0 ms 0 KB -