Submission #937079

#	Time	Username	Problem	Language	Result	Execution time	Memory
937079		Muaath_5	Combo (IOI18_combo)	C++17	100 / 100	17 ms	1860 KiB

combo

#ifdef MUAATH_5
#include "ioi.h"
#else
#include "combo.h"
#endif

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

string guess_sequence(int n)
{
	string sol = "";
	vector<string> p = {"A", "B", "X", "Y"};
	if (press("AB")) {
		if (press("A"))
			sol += "A";
		else
			sol += "B";
	}
	else {
		if (press("X"))
			sol += "X";
		else
			sol += "Y";
	}
	p.erase(find(p.begin(), p.end(), sol));

	if (n == 1) return sol;

	for (int i = 1; i < n-1; i++) {
		string ask = "";
		for (auto x : p)
			ask += sol + p[0] + x;
		ask += sol + p[1];
		int res = press(ask);
		if (res == i + 2)
			sol += p[0];
		else if (res == i + 1)
			sol += p[1];
		else
			sol += p[2];
	}

	if (press(sol + p[0] + sol + p[1]) == sol.size() + 1) {
		if (press(sol + p[0]) == sol.size() + 1)
			sol += p[0];
		else
			sol += p[1];
	}
	else {
		sol += p[2];
	}
	return sol;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:44:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  if (press(sol + p[0] + sol + p[1]) == sol.size() + 1) {
      |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:45:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   if (press(sol + p[0]) == sol.size() + 1)
      |       ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

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