Submission #115385

#	Time	Username	Problem	Language	Result	Execution time	Memory
115385		kitoha	Combo (IOI18_combo)	C++14	5 / 100	3 ms	200 KiB

combo

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

using namespace std;

char key[] = { 'A','B','X','Y' };

string guess_sequence(int N) {
	string s = "";
	char element[3];
	int pos = 0;
	int idx = 0;
	if (press("AB") >= 1) {
		if (press("A") >= 1) s = "A", idx = 0;
		else s = "B", idx = 1;
	}
	else {
		if (press("XY") >= 1) {
			if (press("X") >= 1) s="X", idx = 2;
			else s="Y", idx = 3;
		}
	}

	for (int i = 0; i <= 3; i++) {
		if (idx == i) continue;
		element[pos++] = key[i];
	}

	for (int i = 1; i < N-1; i++) {
		string p = s + element[0] + element[0] + s + element[0] + element[1] + s + element[0] + element[2] + s + element[1];
		int cnt = press(p);
		if (cnt == s.size() + 2) s = s + element[0];
		else if (cnt == s.size() + 1) s = s + element[1];
		else s = s + element[2];
	}

	if (press(s + element[0])==s.size()+1) s += element[0];
	else if (press(s + element[1])==s.size()+1) s += element[1];
	else s += element[2];

	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:32:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   if (cnt == s.size() + 2) s = s + element[0];
      |       ~~~~^~~~~~~~~~~~~~~
combo.cpp:33:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |   else if (cnt == s.size() + 1) s = s + element[1];
      |            ~~~~^~~~~~~~~~~~~~~
combo.cpp:37:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  if (press(s + element[0])==s.size()+1) s += element[0];
      |      ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
combo.cpp:38:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |  else if (press(s + element[1])==s.size()+1) s += element[1];
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

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