Submission #787183

#	Time	Username	Problem	Language	Result	Execution time	Memory
787183		resolve100	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
#include "combo.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)
#define read_file freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);


using namespace std;

string chars[] = {"A", "B", "X", "Y"};

string guess_sequence(int N){
	string out;

	int no;
	for (int i = 0; i < 3; i++){
		int num = press(chars[i]);
		if (num){
			out.append(chars[i]);
			no = i;
			break;
		}
	}
	if (out.size() == 0) out.pb(chars[3]);

	for (int i = 1; i < N; i++){
		if (no == 3){
			for (int j = 2; j > 1; j--){
				int num = press(out+chars[j]);
				if (num == i+1){
					out.append(chars[j]);
					break;
				}
			}
			if (out.size() == i) out.append(arr[0]);
		}
		else{
			for (int j = 0; j < 3; j++){
				if (i == j) continue;
				int num = press(out+chars[i]);
				if (num == i+1){
					out.append(chars[i]);
					break;
				}
			}
			if (out.size() == i) out.append(arr[3]);
		}
	
	}
	return out;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:26:37: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'char'
   26 |  if (out.size() == 0) out.pb(chars[3]);
      |                              ~~~~~~~^
      |                                     |
      |                                     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)
      |                 ~~~~~~~^~~
combo.cpp:37:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |    if (out.size() == i) out.append(arr[0]);
      |        ~~~~~~~~~~~^~~~
combo.cpp:37:36: error: 'arr' was not declared in this scope
   37 |    if (out.size() == i) out.append(arr[0]);
      |                                    ^~~
combo.cpp:48:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |    if (out.size() == i) out.append(arr[3]);
      |        ~~~~~~~~~~~^~~~
combo.cpp:48:36: error: 'arr' was not declared in this scope
   48 |    if (out.size() == i) out.append(arr[3]);
      |                                    ^~~