Submission #677113

#	Time	Username	Problem	Language	Result	Execution time	Memory
677113		hello_there_123	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
//#include "combo.h"
using namespace std;
string arr[4]={"A","B","X","Y"};
set<string>s;
int press(string s){};
string guess_sequence(int N){
	string ans = "";
	string start = "";
	s.insert("A");
	s.insert("B");
	s.insert("X");
	s.insert("Y");
	for(int i=0;i<3;i++){
		if(press(arr[i]) == 1){
			start = arr[i];
			break;
		}
	}
	s.erase(start);
	vector<string>v;
	for(auto string:s) v.push_back(string);
	if(start == "") start = "Y";
	ans+=start;
	for(int i=0;i<N-2;i++){
		string tr = "";
		tr+=ans;
		tr+=v[0];
		tr+=ans;
		tr+=v[1];
		tr+=v[0];
		tr+=ans;
		tr+=v[1];
		tr+=v[1];
		tr+=ans;
		tr+=v[1];
		tr+=v[2];
		if(press(tr) == ans.length()){
			ans+=v[2];
		}
		else if(press(tr) == ans.length()+1){
			ans+=v[0];
		}
		else ans+=v[1];
		
	}
	if(press(ans+v[0]) == N) return ans+v[0];
	if(press(ans+v[1]) == N) return ans+v[1];
	return ans+v[2];
 
}

Compilation message (stderr)

combo.cpp: In function 'int press(std::string)':
combo.cpp:6:21: warning: no return statement in function returning non-void [-Wreturn-type]
    6 | int press(string s){};
      |                     ^
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:38:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   if(press(tr) == ans.length()){
      |      ~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:41:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   else if(press(tr) == ans.length()+1){
      |           ~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/cc6aq8NX.o: in function `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/ccS5URrZ.o:combo.cpp:(.text.unlikely+0x0): first defined here
collect2: error: ld returned 1 exit status