Submission #1191911

#	Time	Username	Problem	Language	Result	Execution time	Memory
1191911		p4r4d0_x	콤보 (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long

string guess_sequence(int N) {
  vector<char> a = {'A', 'B', 'X', 'Y'};
  string s;
  if(press("AB") == 2){
    s = "A";  
  }
  else if(press("AB") == 1){
    if(press("A") == 1){
        s = "A";
    }
    else s = "B";
  }
  else if(press("XY") == 2){
      s = "X";
  }
  else if(press("XY") == 1){
      if(press("X") == 1){
          s = "X";
      }
      else s = "Y";
  }
  ll cnt = 1;
  vector<char> v;
  for(int i = 0; i < 4; ++i){
      if(a[i] != s[0]){
          v.pb(a[i]);
      }
  }
  char b = v[0], x = v[1], y = v[2];
  while(cnt + 1 != N){
      ll count = press(s + b + s + x + b + s + x + y + s + x + x);
      if(count == cnt + 1){
          s += b;
      }
      else if(count == cnt + 2){
          s += x;
      }
      else s += y;
      cnt++;
  }
  if(press(S + "AB") == 2){
    s += "A";  
  }
  else if(press(s + "AB") == 1){
    if(press(s + "A") == 1){
        s += "A";
    }
    else s += "B";
  }
  else if(press(s + "XY") == 2){
      s += "X";
  }
  else if(press(s + "XY") == 1){
      if(press(s + "X") == 1){
          s += "X";
      }
      else s += "Y";
  }
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:47:12: error: 'S' was not declared in this scope
   47 |   if(press(S + "AB") == 2){
      |            ^