Submission #1227734

#	Time	Username	Problem	Language	Result	Execution time	Memory
1227734		Tesla89	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"

using namespace std;

string guess_sequence(int N) {
    string res="";
    vector<char> ch;
    if(press("AB")>0){
        if(press("A")==1){
            res="A";
            ch = {'B','X','Y'};
        }
        else{
            res="B";
            ch = {'A','X','Y'};
        }
    }
    else if(press("X")==1){
        res="X";
        ch = {'A','B','Y'};
    }
    else{
        res="Y";
        ch = {'A','B','X'};
    }
    string query="";
    int last=1;
    for(int i=1;i<N-1;i++){
        for(int j=0;j<3;j++){
            query+=res+ch[2]+ch[j];
        }
        query+=res+ch[1];
        int response=press(query);
        res+=ch[response-last];
        last=response;
        query="";
    }
    query=res+ch[0]+res+ch[1];
    if(press(query)==last)res+=ch[2];
    else if(press(res+ch[0])==last)res+=ch[1];
    else res+=ch[0];
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:7:5: error: 'vector' was not declared in this scope
    7 |     vector<char> ch;
      |     ^~~~~~
combo.cpp:2:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    1 | #include "combo.h"
  +++ |+#include <vector>
    2 | 
combo.cpp:7:12: error: expected primary-expression before 'char'
    7 |     vector<char> ch;
      |            ^~~~
combo.cpp:11:13: error: 'ch' was not declared in this scope
   11 |             ch = {'B','X','Y'};
      |             ^~
combo.cpp:15:13: error: 'ch' was not declared in this scope
   15 |             ch = {'A','X','Y'};
      |             ^~
combo.cpp:20:9: error: 'ch' was not declared in this scope
   20 |         ch = {'A','B','Y'};
      |         ^~
combo.cpp:24:9: error: 'ch' was not declared in this scope
   24 |         ch = {'A','B','X'};
      |         ^~
combo.cpp:30:24: error: 'ch' was not declared in this scope
   30 |             query+=res+ch[2]+ch[j];
      |                        ^~
combo.cpp:32:20: error: 'ch' was not declared in this scope
   32 |         query+=res+ch[1];
      |                    ^~
combo.cpp:38:15: error: 'ch' was not declared in this scope
   38 |     query=res+ch[0]+res+ch[1];
      |               ^~