oj.uz

Submission #718215

# Submission time Handle Problem Language Result Execution time Memory
718215 2023-04-03T16:38:55 Z Tigerpants Colors (BOI20_colors) C++17
0 / 100
 0 ms 208 KB 
#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <map>
#include <functional>
#include <numeric>

using namespace std;

typedef long long int ll;
typedef vector<ll> vll;

ll logll(ll x) {
    for (ll logx = 0; ; (x >>= 1) && (logx++)) if (x == 0) return logx;
}

bool ask(ll p) {
    cout << "? " << p << endl;
    bool answ;
    cin >> answ;
    return answ;
}

ll N;
ll lower = 0;
ll upper;

ll P;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> N;
    upper = 2 << logll(N - 1);

    P = (N + 2) / 3;

    ask(P);

    while ((lower + 1 < upper) && (lower < N - 1)) {
        ll mid = (upper + lower) / 2;
        if (2 * P > N) P -= mid;
        else P += mid;
        if (ask(P)) {
            upper = mid;
        } else {
            lower = mid;
        }
    }

    cout << "= " << min<ll>(N, upper) << endl;

    return 0;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -