Submission #706728

#	Time	Username	Problem	Language	Result	Execution time	Memory
706728		Yell0	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
 
using namespace std;
const int MN=2e3+2;

string guess_sequence(int N) {
  vector<char> ch={'A','B','X','Y'};
  if(press("AB")) {
    if(press("B")) swap(ch[0],ch[1]);
  } else {
    if(press("X")) swap(ch[0],ch[2]);
    else swap(ch[0],ch[3]);
  }
  string ans="";
  ans.push_back(ch[0]);
  for(int i=1;i<N;++i) {
    int r=press(ans+ch[1]+ans+ch[2]+ch[1]+ans+ch[2]+ch[2]+ans+ch[2]+ch[3]);
    if(r==i) ans.push_back(ch[3]);
    else if(r==i+1) ans.push_back(ch[1]);
    else ans.push_back(ch[2]);
  }
  if(press(ans+ch[1])==N) ans.push_back(ch[1]);
  else {
    if(press(ans+ch[2])==N) ans.push_back(ch[2]);
    else ans.push_back(ch[3]);
  }
  return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:8:6: error: 'press' was not declared in this scope
    8 |   if(press("AB")) {
      |      ^~~~~
combo.cpp:17:11: error: 'press' was not declared in this scope
   17 |     int r=press(ans+ch[1]+ans+ch[2]+ch[1]+ans+ch[2]+ch[2]+ans+ch[2]+ch[3]);
      |           ^~~~~
combo.cpp:22:6: error: 'press' was not declared in this scope
   22 |   if(press(ans+ch[1])==N) ans.push_back(ch[1]);
      |      ^~~~~