Submission #787167

#	Time	Username	Problem	Language	Result	Execution time	Memory
787167		resolve100	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)

using namespace std;


string guess_sequence(int N){
    string chars[] = {"A", "B", "X", "Y"};
    bool used[4]; for (int i = 0; i < 4; i++) used[i] = false;

    string out;
    for (int i = 0; i < 4; i++){
        int num = press(chars[i]);
        if (num){
            out+=chars[i];
            used[i] = true;
            break;
        }
    }

    for (int i = 1; i < N; i++){
        for (int j = 0; j < 4; i++){
            if (used[j]) continue;
            int num = press(out+chars[j]);
            if (num > i){
                out.pb(chars[j]);
                break;
            }
        }
    }

    return out;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:16:19: error: 'press' was not declared in this scope
   16 |         int num = press(chars[i]);
      |                   ^~~~~
combo.cpp:27:23: error: 'press' was not declared in this scope
   27 |             int num = press(out+chars[j]);
      |                       ^~~~~
combo.cpp:29:31: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char'
   29 |                 out.pb(chars[j]);
      |                        ~~~~~~~^
      |                               |
      |                               std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 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)
      |                 ~~~~~~~^~~