Submission #115383

#	Time	Username	Problem	Language	Result	Execution time	Memory
115383		kitoha	Combo (IOI18_combo)	C++14	97 / 100	47 ms	520 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];
	}

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

	if (s.size()!=N) {
		if (press(s + element[0]) == s.size()+1) s.push_back(element[0]);
		else if (press(s + element[1]) == s.size()+1) s.push_back(element[1]);
		else s.push_back(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()) {
      |       ~~~~^~~~~~~~~~~
combo.cpp:35:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   else if (cnt == s.size()+1) {
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:38:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |    if (cnt == s.size()) s = s + element[0] + element[2];
      |        ~~~~^~~~~~~~~~~
combo.cpp:39:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |    else if (cnt == s.size()+1) s = s + element[1] + element[1];
      |             ~~~~^~~~~~~~~~~~~
combo.cpp:42:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   else if (cnt == s.size()+2) {
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:45:12: 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 (cnt == s.size()) s = s + element[1] + element[0];
      |        ~~~~^~~~~~~~~~~
combo.cpp:46:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |    else if (cnt == s.size()+1) s = s + element[0] + element[0];
      |             ~~~~^~~~~~~~~~~~~
combo.cpp:51:14: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |  if (s.size()!=N) {
      |      ~~~~~~~~^~~
combo.cpp:52:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   if (press(s + element[0]) == s.size()+1) s.push_back(element[0]);
      |       ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:53:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |   else if (press(s + element[1]) == s.size()+1) s.push_back(element[1]);
      |            ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95