oj.uz

Submission #255880

# Submission time Handle Problem Language Result Execution time Memory
255880 2020-08-02T03:38:17 Z 임성재(#5031) Colors (BOI20_colors) C++17
0 / 100
 0 ms 256 KB 
#include<bits/stdc++.h>  
using namespace std;  
  
#define fast ios::sync_with_stdio(false);cin.tie(NULL)  
#define fi first  
#define se second  
#define all(v) (v).begin(),(v).end()  
#define pb push_back  
#define eb emplace_back
#define pre(a) cout<<fixed; cout.precision(a)
#define mp make_pair
  
typedef long long ll;  
typedef pair<int,int> pii;  
typedef pair<ll,ll> pll;  
const long long INF = 1e18;
const int inf = 1e9;

ll n;

bool f(ll k) {
	cout << "? " << k << endl;

	bool flag;
	cin >> flag;

	return flag;
}

int main() {
	cin >> n;

	ll l = 1, r = n;
	ll cur = 0;

	for(int i=1; l != r; i = 1 - i) {
		ll m = l + r >> 1;

		if(i) cur += m;
		else cur -= m;

		l = m + 1;
	}

	if(cur < 0) cur = 1 - cur;
	else cur++;

	f(cur);

	l = 1, r = n;

	while(l != r) {
		ll m = l + r >> 1;

		if(cur + m <= n) cur += m;
		else cur -= m;

		if(f(cur)) r = m;
		else l = m+1;
	}

	cout << "= " << l << endl;
}

Compilation message

Colors.cpp: In function 'int main()':
Colors.cpp:37:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~
Colors.cpp:53:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (7 queries)
3 Incorrect 0 ms 256 KB Hair color 7 was used multiple times
4 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (7 queries)
3 Incorrect 0 ms 256 KB Hair color 7 was used multiple times
4 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (7 queries)
3 Incorrect 0 ms 256 KB Hair color 7 was used multiple times
4 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (7 queries)
3 Incorrect 0 ms 256 KB Hair color 7 was used multiple times
4 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (7 queries)
3 Incorrect 0 ms 256 KB Hair color 7 was used multiple times
4 Halted 0 ms 0 KB -