Submission #436398

#	Time	Username	Problem	Language	Result	Execution time	Memory
436398		stoyan_malinin	Combo (IOI18_combo)	C++14	10 / 100	84 ms	452 KiB

combo

#include <algorithm>
#include <iostream>
#include <vector>
#include <string>

#include "combo.h"
#ifdef __LOCAL
#include "grader.cpp"
#endif // __LOCAL

using namespace std;

char extend(string &ans)
{
    vector <char> options = {'A', 'B', 'X', 'Y'};
    if(ans.size()!=0)
        options.erase(find(options.begin(), options.end(), ans[0]));

    if(ans.size()==0)
    {
        for(char c: options)
        {
            if(press(ans+c)==ans.size()+1) return c;
        }
    }
    else
    {
        int res = press(ans+options[0]+ans+options[1]);
        if(res==ans.size()) return options[2];

        res = press(ans+options[0]);
        if(res==ans.size()) return options[1];

        return options[0];
    }
}

string guess_sequence(int N)
{
    string ans = "";
    for(int i = 0;i<N;i++) ans += extend(ans);

    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'char extend(std::string&)':
combo.cpp:23:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |             if(press(ans+c)==ans.size()+1) return c;
      |                ~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:29:15: 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(res==ans.size()) return options[2];
      |            ~~~^~~~~~~~~~~~
combo.cpp:32:15: 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(res==ans.size()) return options[1];
      |            ~~~^~~~~~~~~~~~
combo.cpp:15:48: warning: control reaches end of non-void function [-Wreturn-type]
   15 |     vector <char> options = {'A', 'B', 'X', 'Y'};
      |                                                ^

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