Submission #144676

#	Time	Username	Problem	Language	Result	Execution time	Memory
144676		FutureHndrxx	Combo (IOI18_combo)	C++14	100 / 100	52 ms	544 KiB

combo

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

int press(string s);

void firstorlast(string &res,char buttons[], char temp[],char narrow[])
{
    if(press(res+buttons[0]+res+buttons[1])>res.size())
    {
        temp[0]=buttons[0],temp[1]=buttons[1];
    }
    else
    {
        temp[0]=buttons[2],temp[1]=buttons[3];
    }
    if(press(res+temp[0])>res.size())
    {
        res+=temp[0];
    }
    else
    {
        res+=temp[1];
    }
    for(int i=0,j=0;i<4;i++)
    {
        if(buttons[i]!=res.back())
        {
            narrow[j]=buttons[i];
            j++;
        }
    }
}

string guess_sequence(int N)
{
    string res="";
    char buttons[4]={'A','B','X','Y'},temp[2]={},narrow[3]={};
    firstorlast(res, buttons, temp, narrow);
    if(N==1)
    {
        return res;
    }
    while(res.size()<N-1)
    {
        int tmp=press(res+narrow[0]+narrow[0]+res+narrow[0]+narrow[1]+res+narrow[0]+narrow[2]+res+narrow[1]);
        if(tmp==res.size())
        {
            res+=narrow[2];
        }
        else if(tmp==res.size()+1)
        {
            res+=narrow[1];
        }
        else
        {
            res+=narrow[0];
        }
    }
    firstorlast(res, buttons, temp, narrow);
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'void firstorlast(std::string&, char*, char*, char*)':
combo.cpp:9:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     if(press(res+buttons[0]+res+buttons[1])>res.size())
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
combo.cpp:17:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     if(press(res+temp[0])>res.size())
      |        ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:44:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |     while(res.size()<N-1)
      |           ~~~~~~~~~~^~~~
combo.cpp:47:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         if(tmp==res.size())
      |            ~~~^~~~~~~~~~~~
combo.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |         else if(tmp==res.size()+1)
      |                 ~~~^~~~~~~~~~~~~~

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