Submission #345693

#	Time	Username	Problem	Language	Result	Execution time	Memory
345693		wwdd	Combo (IOI18_combo)	C++14	100 / 100	46 ms	564 KiB

combo

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

std::string guess_sequence(int N) {
	const string rop[4] = {"A","B","X","Y"};
	int ena = press("AB");
	int of = 0;
	if(ena >= 1) {
		int enb = press("A");
		if(enb) {
			of = 0;
		} else {
			of = 1;
		}
	} else {
		int enb = press("X");
		if(enb) {
			of = 2;
		} else {
			of = 3;
		}
	}
	string op[4] = {rop[(of+1)%4],rop[(of+2)%4],rop[(of+3)%4],rop[of]};
	char cop[4] = {op[0][0],op[1][0],op[2][0],op[3][0]};
	string S = op[3];
	while(S.size() < N-1) {
		int val = press(S+op[0]+S+op[1]+op[0]+S+op[1]+op[1]+S+op[1]+op[2]);
		if(val == S.size()+1) {
			S.push_back(cop[0]);
		} else if(val == S.size()+2) {
			S.push_back(cop[1]);
		} else {
			S.push_back(cop[2]);
		}
	}
	if(S.size() == N-1) {
		if(press(S+op[0]) == N) {
			S.push_back(cop[0]);
		} else if(press(S+op[1])  == N) {
			S.push_back(cop[1]);
		} else {
			S.push_back(cop[2]);
		}
	}
	return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:27:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   27 |  while(S.size() < N-1) {
      |        ~~~~~~~~~^~~~~
combo.cpp:29:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   if(val == S.size()+1) {
      |      ~~~~^~~~~~~~~~~~~
combo.cpp:31:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   } else if(val == S.size()+2) {
      |             ~~~~^~~~~~~~~~~~~
combo.cpp:37:14: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |  if(S.size() == N-1) {
      |     ~~~~~~~~~^~~~~~

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