Submission #369144

#	Time	Username	Problem	Language	Result	Execution time	Memory
369144		wind_reaper	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string string_guess(int N){
	string ans;
	vector<string> s = {"A", "B", "X", "Y"};
	bool f = false;
	for(int i = 0; i < 3 && !f; i++){
		if(press(s[i]) == 1){
			ans += s[i];
			s.erase(s.begin() + i);
			f = true;
		}
	}
	if(!f){
		ans += 'Y';
		s.erase(s.begin() + 3);
	}
	for(int i = 1; i < N-1; i++){
		string query = ans + s[0] + ans + s[1] + s[0] + ans + s[1] + s[1] + ans + s[1] + s[2];
		int r = press(query);
		if(r == ans.size() + 1){
			ans += s[0];
			continue;
		}
		if(r == ans.size() + 2){
			ans += s[1];
			continue;
		}
		if(r == ans.size()){
			ans += s[2];
			continue;
		}
	}
	f = false;
	for(int i = 0; i < 2 && !f; i++){
		if(press(ans + s[i]) == N){
			ans += s[i];
			f = true;
		}
	}
	if(!f){
		ans += s[2];
	}
	return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string string_guess(int)':
combo.cpp:22:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   if(r == ans.size() + 1){
      |      ~~^~~~~~~~~~~~~~~~~
combo.cpp:26:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   if(r == ans.size() + 2){
      |      ~~^~~~~~~~~~~~~~~~~
combo.cpp:30:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |   if(r == ans.size()){
      |      ~~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccf97ZHF.o: in function `main':
grader.cpp:(.text.startup+0x4c): undefined reference to `guess_sequence[abi:cxx11](int)'
collect2: error: ld returned 1 exit status