Submission #1259834

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259834		sokratisi	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <string>
#include <set>

using namespace std;

int coins;
string use;

//int press(string p);

char find_first() {
  use = "AB";
  coins = press(use);
  if (coins) {
    use = "A";
    coins = press(use);
    if (coins) return 'A';
    else return 'B';  
  }
  use = "X";
  coins = press(use);
  if (coins) return 'X';
  else return 'Y';
}

string guess_sequence(int n) {
  char c = find_first();
  set<char> s = {'A', 'B', 'X', 'Y'};
  s.erase(c);
  vector<char> chrs;
  for (auto u: s) chrs.push_back(u);

  string p = "";
  p += c;
  for (int i = 2; i <= n - 1; i++) {
    use = p + chrs[0] + chrs[0] + p + chrs[0] + chrs[1] + p + chrs[0] + chrs[2] + p + chrs[1];
    int coins = press(use);
    if (coins == i + 1) p += chrs[0];
    else if (coins == i) p += chrs[1];
    else p += chrs[2];
  }
  use = p + chrs[0];
  coins = press(use);
  if (coins == n) return use;
  use = p + chrs[1];
  coins = press(use);
  if (coins == n) return use;
  return (p + chrs[2]);
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:3: error: 'vector' was not declared in this scope
   31 |   vector<char> chrs;
      |   ^~~~~~
combo.cpp:4:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    3 | #include <set>
  +++ |+#include <vector>
    4 | 
combo.cpp:31:10: error: expected primary-expression before 'char'
   31 |   vector<char> chrs;
      |          ^~~~
combo.cpp:32:19: error: 'chrs' was not declared in this scope
   32 |   for (auto u: s) chrs.push_back(u);
      |                   ^~~~
combo.cpp:37:15: error: 'chrs' was not declared in this scope
   37 |     use = p + chrs[0] + chrs[0] + p + chrs[0] + chrs[1] + p + chrs[0] + chrs[2] + p + chrs[1];
      |               ^~~~
combo.cpp:43:13: error: 'chrs' was not declared in this scope
   43 |   use = p + chrs[0];
      |             ^~~~