Submission #380900

#	Time	Username	Problem	Language	Result	Execution time	Memory
380900		ritul_kr_singh	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include "bits/stdc++.h"
using namespace std;

string guess_sequence(int n){
	string s;
	if(press("AB"))
		s = press("A") ? "A" : "B";
	else
		s = press("X") ? "X" : "Y";

	string all, orig = "ABXY";
	for(char c : orig) if(c!=s[0]) all.push_back(c);

	for(int i=1; i+1<n; ++i){
		string t;
		for(char c : all) t.push_back(s + all[2] + c);
		t.push_back(s + all[1]);
		s += all[press(t)-i];
	}

	string t;
	if(press(s+all[0]+s+all[1])==n)
		s += (press(s+all[0])==n) ? all[0] : all[1];
	else s += all[2];
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:17:44: error: cannot convert 'std::__cxx11::basic_string<char>' to 'char'
   17 |   for(char c : all) t.push_back(s + all[2] + c);
      |                                 ~~~~~~~~~~~^~~
      |                                            |
      |                                            std::__cxx11::basic_string<char>
In file included from /usr/include/c++/10/string:55,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/bits/basic_string.h:1320:24: note:   initializing argument 1 of 'void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 1320 |       push_back(_CharT __c)
      |                 ~~~~~~~^~~
combo.cpp:18:17: error: cannot convert 'std::__cxx11::basic_string<char>' to 'char'
   18 |   t.push_back(s + all[1]);
In file included from /usr/include/c++/10/string:55,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/bits/basic_string.h:1320:24: note:   initializing argument 1 of 'void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 1320 |       push_back(_CharT __c)
      |                 ~~~~~~~^~~