Submission #719429

#	Time	Username	Problem	Language	Result	Execution time	Memory
719429		AndrijaM	Combo (IOI18_combo)	C++14	88 / 100	35 ms	596 KiB

combo

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

using ll=long long;

using namespace std;


string guess_sequence(int n)
{
    vector<string>v;
    v.push_back("A");
    v.push_back("B");
    v.push_back("X");
    v.push_back("Y");
    string ans="";
    bool ok=false;
    string c;
    if(!ok && press("A"))
    {
        ok=true;
        v.erase(v.begin()+0);
        c="A";
        ans+="A";
    }
    if(!ok && press("B"))
    {
        ok=true;
        v.erase(v.begin()+1);
        c="B";
        ans+="B";
    }
    if(!ok && press("X"))
    {
        ok=true;
        c="X";
        v.erase(v.begin()+2);
        ans+="X";
    }
    if(!ok && press("Y"))
    {
        ok=true;
        c="Y";
        v.erase(v.begin()+3);
        ans+="Y";
    }
    int k=1;
    while(true)
    {
        string sp=ans;
        string nstr;
        if(sp.size()>1)
        {
            sp.erase(sp.begin()+0);
            nstr=ans+v[0]+c+sp+v[1]+v[0]+ans+v[1]+v[1]+ans+v[1]+v[2];
        }
        else
        {
            nstr=ans+v[0]+c+v[1]+v[0]+ans+v[1]+v[1]+ans+v[1]+v[2];
        }
        if(nstr.size()<=4*n)
        {
            int kol=press(nstr);
            if(kol==k)
            {
                ans+=v[2];
            }
            else if(kol==k+1)
            {
                ans+=v[0];
            }
            else if(kol==k+2)
            {
                ans+=v[1];
            }
        }
        else
        {
            if(press(ans)==n)
            {
                break;
            }
            if(press(ans+v[0])==n)
            {
                ans+=v[0];
                break;
            }
            if(press(ans+v[1])==n)
            {
                ans+=v[1];
                break;
            }
            if(press(ans+v[2])==n)
            {
                ans+=v[2];
                break;
            }
        }
        k=ans.size();
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:61:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |         if(nstr.size()<=4*n)
      |            ~~~~~~~~~~~^~~~~

• Subtask 1: 5 / 5
• Subtask 2: 83 / 95