Submission #1142694

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142694		redaisthegoat	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int N) {
  string S="";
  int rep = press("AB");
  int a;
  if(rep>=1){
      rep= press("A");
      if(rep==1){
          S+='A';
          while(S.length()<N){
              a=S.length();
              string comb=S+"B"+S+"XX"+S+"XY"+S+"XB";
              rep = press(comb);
              if(rep==a+1){
                  S+="B";
              }
              if(rep==a+2){
                  S+="X";
                  
              }
              else S+="Y";
                  
            }
            rep= press(S+"X");
            if(rep==1) S+="X";
            else{
                rep= press(S+="B");
                if(rep==1) S+="B";
                else S+="Y";
            }
          
      }
      else {
          S+='B';
          while(S.length()<N){
              a=S.length();
              string comb=S+"A"+S+"XX"+S+"XY"+S+"XA";
              rep = press(comb);
              if(rep==a+1){
                  S+="A";
              }
              if(rep==a+2){
                  S+="X";
                  
              }
              else S+="Y";
                  
            }
            rep= press(S+"X");
            if(rep==1) S+="X";
            else{
                rep= press(S+="A");
                if(rep==1) S+="A";
                else S+="Y";
            }
      }
  }
      
  }
  if(rep==0){
      rep = press('X');
      if(rep==1){
          S+='X';
          while(S.length()<N){
              a=S.length();
              string comb=S+"Y"+S+"AA"+S+"AB"+S+"AY";
              rep = press(comb);
              if(rep==a+1){
                  S+="Y";
              }
              if(rep==a+2){
                  S+="A";
                  
              }
              else S+="B";
                  
            }
            rep= press(S+"A");
            if(rep==1) S+="A";
            else{
                rep= press(S+="Y");
                if(rep==1) S+="Y";
                else S+="B";
            }
      }
      else{
          S+='Y';
          while(S.length()<N){
              a=S.length();
              string comb=S+"X"+S+"AA"+S+"AB"+S+"AX";
              rep = press(comb);
              if(rep==a+1){
                  S+="X";
              }
              if(rep==a+2){
                  S+="A";
                  
              }
              else S+="B";
                  
            }
            rep= press(S+"A");
            if(rep==1) S+="A";
            else{
                rep= press(S+="X");
                if(rep==1) S+="X";
                else S+="B";
            }
      }
          
  }

  
  return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:61:3: warning: no return statement in function returning non-void [-Wreturn-type]
   61 |   }
      |   ^
combo.cpp: At global scope:
combo.cpp:62:3: error: expected unqualified-id before 'if'
   62 |   if(rep==0){
      |   ^~
combo.cpp:116:3: error: expected unqualified-id before 'return'
  116 |   return S;
      |   ^~~~~~
combo.cpp:117:1: error: expected declaration before '}' token
  117 | }
      | ^