Submission #154666

#	Time	Username	Problem	Language	Result	Execution time	Memory
154666		rama_pang	Combo (IOI18_combo)	C++14	100 / 100	56 ms	568 KiB

combo

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

string guess_sequence(int N) {
	if (N == 1) {
		if (press("A") == 1) return "A";
		if (press("B") == 1) return "B";
		if (press("X") == 1) return "X";
		return "Y";
	}
	string cur = "";
	int tmp;
	tmp = press("AB");
	if (tmp >= 1) {
		tmp = press("A");
		if (tmp == 1) cur = "A";
		else cur = "B";
	} else {
		tmp = press("X");
		if (tmp == 1) cur = "X";
		else cur = "Y";
	}

	vector<char> ls;
	if (cur[0] != 'A') ls.push_back('A');
	if (cur[0] != 'B') ls.push_back('B');
	if (cur[0] != 'X') ls.push_back('X');
	if (cur[0] != 'Y') ls.push_back('Y');

	while (cur.size() < N - 1) {
		string guess;
		guess = cur + ls[0] + cur + ls[1] + ls[0] + cur + ls[1] + ls[1] + cur + ls[1] + ls[2];
		tmp = press(guess);
		if (tmp == cur.size()) {
			cur.push_back(ls[2]);
		} else if (tmp == cur.size() + 1) {
			cur.push_back(ls[0]);
		} else {
			cur.push_back(ls[1]);
		}
	}
	tmp = press(cur + ls[0]);
	if (tmp == N) {
		cur.push_back(ls[0]);
	} else {
		tmp = press(cur + ls[1]);
		if (tmp == N) cur.push_back(ls[1]);
		else cur.push_back(ls[2]);
	}
	return cur;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   31 |  while (cur.size() < N - 1) {
      |         ~~~~~~~~~~~^~~~~~~
combo.cpp:35:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   if (tmp == cur.size()) {
      |       ~~~~^~~~~~~~~~~~~
combo.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |   } else if (tmp == cur.size() + 1) {
      |              ~~~~^~~~~~~~~~~~~~~~~

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