Submission #1172498

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1172498	2025-03-23 18:06:19	versesrev	Combo (IOI18_combo)	C++20	0 / 100	0 ms	400 KiB

combo

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// 17:31
#include <string>
#include <vector>
#include <functional>
#include <cassert>
#include "combo.h"
std::string guess_sequence (int N) {
  std::vector<char> cs{'A', 'B', 'X', 'Y'};
  char start = std::invoke([&]{
    int v1 = press("AB");
    if (v1 == 1) {
      if (press("A") == 1) return 'A';
      else return 'B';
    }
    else {
      if (press("X") == 1) return 'X';
      else return 'Y';
    }
  });
  
  std::erase(cs, start);
  
  std::string ans;
  ans += start;
  if (N == 1) {
    return ans;
  }
  for (int i = 1; i < N - 1; ++i) {
 
 
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• Subtask 1: 0 / 5
• Subtask 2: 0 / 95