Submission #741753

#	Time	Username	Problem	Language	Result	Execution time	Memory
741753		MODDI	Combo (IOI18_combo)	C++14	100 / 100	36 ms	592 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
std::string guess_sequence(int n) {
	string chars = "ABXY", str = "";
	char first;
	if(press("AB")){
		if(press("A"))	first = 'A';
		else first = 'B';
	}
	else{
		if(press("X"))	first = 'X';
		else first = 'Y';
	}
	str.pb(first);
	chars.erase(find(chars.begin(), chars.end(), first));
	if(n == 1)	return str;
	while(str.size() < n-1){
		string t = str + chars[0];
		for(auto ch : chars){
			t = t + str + chars[1] + ch;
		}
		int res = press(t);
		if(res == str.size()){
			str.pb(chars[2]);
		}
		else if(res == str.size()+1)
			str.pb(chars[0]);
		else
			str.pb(chars[1]);
	}
	for(int i = 0; i < 2; i++){
		str.pb(chars[i]);
		if(press(str) == n)	return str;
		
		str.pop_back(); 
	}
	str.pb(chars[2]);
	return str;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:19:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   19 |  while(str.size() < n-1){
      |        ~~~~~~~~~~~^~~~~
combo.cpp:25:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |   if(res == str.size()){
      |      ~~~~^~~~~~~~~~~~~
combo.cpp:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   else if(res == str.size()+1)
      |           ~~~~^~~~~~~~~~~~~~~

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