Submission #1157246

#	Time	Username	Problem	Language	Result	Execution time	Memory
1157246		LucaLucaM	Colors (BOI20_colors)	C++20	0 / 100	0 ms	408 KiB

Colors

#include <iostream>
#include <vector>
#include <algorithm>
#include <cassert>

using ll = long long;
#define debug(x) #x << " = " << x << '\n'

int secret = 4;
ll prev_color = -1;

int query(ll x) {
  std::cout << "? " << x << std::endl;
  // #ifdef LOCAL
  //   if (prev_color == -1) {
  //     prev_color = x;
  //     return 0;
  //   }  
  //   int ret = std::abs(prev_color - x) >= secret;
  //   prev_color = x;
  //   return ret; 
  // #else
    int ret;
    std::cin >> ret;
    return ret;
  // #endif
}

int main() {
  #ifdef LOCAL
    // freopen("input.txt", "r", stdin);
  #endif
  // std::ios_base::sync_with_stdio(false);
  // std::cin.tie(0);

  ll n;
  std::cin >> n;
  
  ll answer = n;
  ll l = 1, r = n - 1;
  while (l <= r) {
    ll mid = (l + r) / 2;
    query(1);
    if (query(mid + 1) == true) { // C <= mid
      answer = mid;
      r = mid - 1;
    } else {
      l = mid + 1;
    }
  }

  std::cout << "= " << answer << std::endl;

  return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33