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Submission #1030349

# Submission time Handle Problem Language Result Execution time Memory
1030349 2024-07-22T03:07:55 Z thinknoexit Colors (BOI20_colors) C++17
0 / 100
 0 ms 344 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll now = 0;
bool ask(ll x) {
    now = x;
    cout << "? " << x << endl;
    cin >> x; return x;
}
void answer(ll x) {
    cout << "= " << x << endl;
    exit(0);
}
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    ll n;
    cin >> n;
    ll l = 1, r = n;
    ask(1);
    while (l < r) {
        if (now == l) {
            if (ask(r)) l += 2;
            else answer(r - l + 1);
        }
        else {
            if (ask(l)) r -= 2;
            else answer(r - l + 1);
        }
    }
    if (now == l) {
        r += 2;
        // r - l == 1
        if (r - l == 1) {
            answer(1);
        }
        else if (r - l == 2) {
            if (ask(r - 1)) answer(1);
            else answer(2);
        }
    }
    else {
        l -= 2;
        if (r - l == 1) {
            answer(1);
        }
        else if (r - l == 2) {
            if (ask(l + 1)) answer(1);
            else answer(2);
        }
    }
    return 0;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Wrong guess
2 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Wrong guess
2 Halted 0 ms 0 KB -