Submission #369148

#	Time	Username	Problem	Language	Result	Execution time	Memory
369148		wind_reaper	Combo (IOI18_combo)	C++17	97 / 100	55 ms	560 KiB

combo

#include <combo.h>
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(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);
	}
	if(N == 1)
		return ans;
	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;
		}
	}
	string query = ans + s[0] + ans + s[1];
	if(press(query) == N){
		query = ans + s[0];
		if(press(query) == N) return query;
		query = ans + s[1];
		return query;
	}
	return (ans + s[2]);
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
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() + 1){
      |      ~~^~~~~~~~~~~~~~~~~
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() + 2){
      |      ~~^~~~~~~~~~~~~~~~~
combo.cpp:34:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   if(r == ans.size()){
      |      ~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95