Submission #1196429

#	Time	Username	Problem	Language	Result	Execution time	Memory
1196429		ffeyyaae_	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 = "";
    string a = "ABXY";
    vector<string> bt;
    if( press("A") ) s += "A";
    else if( press("B") ) s += "B";
    else if( press("X") ) s += "X";
    else s += "Y";
    if( N == 1 ) return s;
    for( auto c : a ) if( s[0] != c ) bt.push_back( c );
    for( int i=1;i<N;i++ )
    {
        string tp = s+bt[0] + s+bt[1]+bt[0] + s+bt[1]+bt[1] + s+bt[1]+bt[2];
        int sz = sizeof(s);
        if( press(tp) == sz+1 ) s += bt[0];
        else if( press(tp) == sz+2 ) s += bt[1];
        else s += bt[2];
    }
    if( press(s+bt[0]) ) s += bt[0];
    else if( press(s+bt[1]) ) s += bt[1];
    else s += bt[2];
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:16:51: error: no matching function for call to 'std::vector<std::__cxx11::basic_string<char> >::push_back(char&)'
   16 |     for( auto c : a ) if( s[0] != c ) bt.push_back( c );
      |                                       ~~~~~~~~~~~~^~~~~
In file included from /usr/include/c++/11/vector:67,
                 from /usr/include/c++/11/functional:62,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from combo.cpp:1:
/usr/include/c++/11/bits/stl_vector.h:1187:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::__cxx11::basic_string<char>; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; std::vector<_Tp, _Alloc>::value_type = std::__cxx11::basic_string<char>]'
 1187 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/11/bits/stl_vector.h:1187:35: note:   no known conversion for argument 1 from 'char' to 'const value_type&' {aka 'const std::__cxx11::basic_string<char>&'}
 1187 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/11/bits/stl_vector.h:1203:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::__cxx11::basic_string<char>; _Alloc = std::allocator<std::__cxx11::basic_string<char> >; std::vector<_Tp, _Alloc>::value_type = std::__cxx11::basic_string<char>]'
 1203 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/11/bits/stl_vector.h:1203:30: note:   no known conversion for argument 1 from 'char' to 'std::vector<std::__cxx11::basic_string<char> >::value_type&&' {aka 'std::__cxx11::basic_string<char>&&'}
 1203 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~