Submission #587815

#	Time	Username	Problem	Language	Result	Execution time	Memory
587815		IvanJ	Combo (IOI18_combo)	C++17	5 / 100	1 ms	464 KiB

combo

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

#define all(a) (a).begin(), (a).end()

using namespace std;

string guess_sequence(int n) {
	string p = "", s = "";
	if(press("A")) s = "A";
	else if(press("B")) s = "B";
	else if(press("X")) s = "X";
	else s = "Y";
  
	set<string> S;
	S.insert("A"), S.insert("B"), S.insert("X"), S.insert("Y");
	S.erase(s);
	vector<string> v(all(S));
	
	for(int i = 1;i < n - 1;i++) {
		p = s + v[0];
		for(int j = 0;j < 3;j++) 
			p += s + v[1] + v[j];
		int x = press(p);
		if(x == (int)s.size() + 1) s += v[0];
		else if(x == (int)s.size() + 2) s += v[1];
		else s += v[2];
	}
	assert(s.size() == n - 1);
	if(press(s + v[0]) == n) s += v[0];
	else if(press(s + v[1]) == n) s += v[1];
	else s += v[2];
	return s;
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from combo.cpp:2:
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |  assert(s.size() == n - 1);
      |         ~~~~~~~~~^~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95