Submission #1052275

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052275		Ahmed57	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "bits/stdc++.h"
#include "combo.h"

using namespace std;
string guess_sequence(int N){
    int a = press("AB");
    string fi;
    if(a){
        if(press("A"))fi = "A";
        else fi = "B";
    }else{
        if(press('X'))fi = "X";
        else fi = "Y";
    }
    set<char> rem;
    if(fi[0]!='X')rem.insert('X');
    if(fi[0]!='A')rem.insert('A');
    if(fi[0]!='B')rem.insert('B');
    if(fi[0]!='Y')rem.insert('Y');
    vector<char> v;
    for(auto i:rem)v.push_back(i);
    for(int i = 2;i<N;i++){
        string qu;
        qu+=fi;
        qu+=v[0];
        qu+=v[0];
        qu+=fi;
        qu+=v[0];
        qu+=v[1];
        qu+=fi;
        qu+=v[0];
        qu+=v[2];
        qu+=fi;
        qu+=v[1];
        int an = press(qu);
        if(an==i-1){
            fi+=v[2];
        }else if(an==i){
            fi+=v[1];
        }else fi+=v[0];
    }
    string qu;
    qu+=fi;
    qu+=v[0];
    qu+=fi;
    qu+=v[1];
    if(press(qu)==N){
        string qu2;
        qu2+=fi;
        qu2+=v[0];
        if(press(qu2)==N){
            fi+=v[0];
        }else fi+=v[1];
    }else fi+=v[2];
    return fi;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:12:18: error: could not convert ''X'' from 'char' to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   12 |         if(press('X'))fi = "X";
      |                  ^~~
      |                  |
      |                  char