Submission #411604

#	Time	Username	Problem	Language	Result	Execution time	Memory
411604		nichke	Combo (IOI18_combo)	C++14	100 / 100	45 ms	592 KiB

combo

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

int press(string p);

string guess_sequence(int n) {
	string but = "AB";
	string res = "";
	if (!press(but)) but = "XY";
	char ff = but[0];
	if (!press(but.substr(0, 1))) ff = but[1];
	but = "ABXY";
	string bt = "";
	for (char c : but) {
		if (c == ff) continue;
		bt += c;
	}
	res += ff;
	if (n <= 1) {
		return res;
	}
	while (res.size() < n - 1) {
		res += bt[press(res + bt[1] + res + bt[2] + bt[0] + res + bt[2] + bt[1] + res + bt[2] + bt[2]) - res.size()];
	}
	if (press(res + bt[0] + res + bt[1]) > res.size()) {
		if (press(res + bt[0]) > res.size()) return res + bt[0];
		return res + bt[1];
	}
	return res + bt[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |  while (res.size() < n - 1) {
      |         ~~~~~~~~~~~^~~~~~~
combo.cpp:25:39: 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 (press(res + bt[0] + res + bt[1]) > res.size()) {
      |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
combo.cpp:26:26: 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 (press(res + bt[0]) > res.size()) return res + bt[0];
      |       ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

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