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Submission #361461

# Submission time Handle Problem Language Result Execution time Memory
361461 2021-01-30T09:20:18 Z phathnv Colors (BOI20_colors) C++11
0 / 100
 1 ms 512 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

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

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

    ll n;
    cin >> n;
    ll l = 1, r = n - 1, start = 1, cur = -1, dir = -1;
    while (l <= r){
        int mid = (l + r) >> 1;
        cur += mid * dir;
        dir *= -1;
        l = mid + 1;
        start = max(start, -cur);
    }

    l = 1, r = n - 1, cur = start, dir = -1;
    Ask(start);
    ll answer = n, delta = 0;
    while (l <= r){
        int mid = (l + r) >> 1;
        cur += (mid + delta) * dir;
        dir *= -1;
        if (Ask(cur)){
            answer = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }

    cout << "= " << answer << endl;
    return 0;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 512 KB Wrong guess
2 Halted 0 ms 0 KB -