Submission #228771

#	Time	Username	Problem	Language	Result	Execution time	Memory
228771		two_sides	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <string>
#include <vector>
 
string guess_sequence(int n){
  string res; vector <char> c = {'A', 'B', 'X', 'Y'};
  if (press("AB") >= 1) res = press("A") ? "A" : "B";
  else res = press("X") ? "X" : "Y";
  c.erase(find(c.begin(), c.end(), res[0]));
  while (int(size(res)) <= n - 2){
    int que = press(res + c[0] + res + c[1] + c[0] + res + c[1] + c[1] + res + c[1] + c[2]);
    if (que == size(res)) res.push_back(c[2]);
    if (que == size(res) + 1) res.push_back(c[0]);
    if (que == size(res) + 2) res.push_back(c[1]);
  }
  if (int(size(res)) < n){
    if (press(res + p[0]) == n) res.push_back(p[0]);
    else if (press(res + p[1]) == n) res.push_back(p[1]);
    else res.push_back(p[2]);
  }
  return res;
}

Compilation message (stderr)

combo.cpp:5:1: error: 'string' does not name a type; did you mean 'stdin'?
    5 | string guess_sequence(int n){
      | ^~~~~~
      | stdin