Submission #1132241

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132241		bobthescience	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"
using namespace std;


std::string guess_sequence(int N) {
  string p = "";
  int ord;
  vector<char> add = {'A', 'B', 'X', 'Y'};
  for (int i = 0;i < 4;i++) {
    if (press("" + add[i])) {
      add.erase(add.begin() + i);
      break;
    }
  }
  for (int i = 1;i < N;i++) {
    for (char c :add) {
      if (press(p + c) > i) {
        r++;
        p += c;
        break;
      }
    }
  }
  return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:19:9: error: 'r' was not declared in this scope
   19 |         r++;
      |         ^