Submission #317845

#	Time	Username	Problem	Language	Result	Execution time	Memory
317845		Drew_	Combo (IOI18_combo)	C++14	100 / 100	46 ms	584 KiB

combo

#include "combo.h"

std::string guess_sequence(int n)
{
    std::string s = "";
    int coins;
    char rem[10];

    coins = press("AB");
    if (coins == 0)
    {
        rem[0] = 'A';
        rem[1] = 'B';

        coins = press("X");
        if (coins == 1) s += 'X', rem[2] = 'Y';
        else s += 'Y', rem[2] = 'X';
    }
    else
    {
        rem[1] = 'X';
        rem[2] = 'Y';

        coins = press("A");
        if (coins == 1) s += 'A', rem[0] = 'B';
        else s += 'B', rem[0] = 'A';
    }

    while (s.size() < n-1)
    {
        std::string p = "";
        for (int i = 0; i < 3; ++i)
            p += (s + rem[0] + rem[i]);
        p += s + rem[1];

        coins = press(p);
        if (coins >= s.size()+2) s += rem[0];
        else if (coins == s.size()+1) s += rem[1];
        else s += rem[2];
    }

    if (s.size() < n)
    {
        if (press(s + rem[0]) == n) s += rem[0];
        else if (press(s + rem[1]) == n) s += rem[1];
        else s += rem[2];
    } 

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while (s.size() < n-1)
      |            ~~~~~~~~~^~~~~
combo.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (coins >= s.size()+2) s += rem[0];
      |             ~~~~~~^~~~~~~~~~~~~
combo.cpp:38:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         else if (coins == s.size()+1) s += rem[1];
      |                  ~~~~~~^~~~~~~~~~~~~
combo.cpp:42:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |     if (s.size() < n)
      |         ~~~~~~~~~^~~

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