Submission #683943

#	Time	Username	Problem	Language	Result	Execution time	Memory
683943		Juan	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
using namespace std;


string guess_sequence(int N){
	string ans = "";
	char A, B, C, D;
	set<int> st;
	st.insert('A'), st.insert('B'), st.insert('X'), st.insert('Y');

	if(press("AB")){
		if(press("A")) A = 'A';
		else A = 'B';
	}
	else{
		if(press("X")) A = 'X';
		else A = 'Y';
	}
	ans+=A;
	st.erase(A);
	auto it = st.begin();
	B = *it, it++, C = *it, it++, D = *it;

	for(int i = 1; i < N-1; i++){
		string aux="";
		aux+=ans, aux+=B, aux+=B;
		aux+=ans, aux+=C, aux+=C;
		int prs = press(aux) - i;
		if(prs==0){
			ans+=C;
		}
		else if(prs==1){
			string aux2="";
			aux2+=ans, aux2+=B;
			if(press(aux2)-i) ans+=B;
			else ans+=C;
			ans+=D;
			i++;
		}
		else if(prs==2){
			string aux2="";
			aux2+=ans, aux2+=B;
			if(press(aux2)-i == 2) ans+=B, ans+=B;
			else ans+=C, ans+=C;
		}
	}

	if(ans.size()<N){
		string aux = "";
		aux+=ans, aux+=B;
		if(press(aux)==N) ans+=B;
		else{
			aux.pop_back();
			aux+=C;
			if(press(aux)==N) ans+=C;
			else ans+=D;
		}
	}

	return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:11:5: error: 'press' was not declared in this scope
   11 |  if(press("AB")){
      |     ^~~~~
combo.cpp:28:13: error: 'press' was not declared in this scope; did you mean 'prs'?
   28 |   int prs = press(aux) - i;
      |             ^~~~~
      |             prs
combo.cpp:48:15: 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(ans.size()<N){
      |     ~~~~~~~~~~^~
combo.cpp:51:6: error: 'press' was not declared in this scope
   51 |   if(press(aux)==N) ans+=B;
      |      ^~~~~