Submission #817718

#	Time	Username	Problem	Language	Result	Execution time	Memory
817718		n3rm1n	Combo (IOI18_combo)	C++17	30 / 100	23 ms	624 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"
#define endl '\n'
using namespace std;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
string guess_sequence(int N)
{
    string p = "A";
    char start;
    if(press(p) != 0)start = 'A';
    else
    {
        p = "B";
        if(press(p) != 0)start = 'B';
        else
        {
            p = "X";
            if(press(p) != 0)start = 'X';
            else
            {
                p = "Y";
                if(press(p) != 0)start = 'Y';
            }
        }
    }
    char free0, free1, free2;
    if(start == 'A')
    {
        free0 = 'B';
        free1 = 'X';
        free2 = 'Y';
    }
    else if(start == 'B')
    {
        free0 = 'A';
        free1 = 'X';
        free2 = 'Y';
    }
    else if(start == 'X')
    {
        free0 = 'A';
        free1 = 'B';
        free2 = 'Y';
    }
    else
    {
        free0 = 'A';
        free1 = 'B';
        free2 = 'X';
    }
    string certain = "";
    certain += start;
    string try0, try1, try2;
    string combo = "";
    int i = 1;
    while(i < N && i + 1 < N)
    {
        try0 = certain + free0;
        try0 = try0 + free0;
        try1 = certain + free1;
        try1 = try1 + free1;
        combo = try0 + try1;
        int result = press(combo), result0;
        if(result == certain.size() + 2)
        {
            if(press(try0) == certain.size() + 2)
                certain = try0;
            else certain = try1;
        }
        else if(result == certain.size() + 1)
        {
            try2 = certain + free0;
            try2 = try2 + free2;
            result0 = press(try2);
            if(result0 == certain.size() + 1)
            {
                certain = certain + free0;
                certain = certain + free1;
            }
            else if(result0 == certain.size() + 2)
            {
                certain = try2;
            }
            else certain = certain + free1;
        }
        else certain = certain + free2;
        i  = certain.size();
    }
    ///cout << certain << endl;
    if(certain.size() < N)
    {
        try0 = certain + free0;
        if(press(try0) == try0.size())
        {
            certain = try0;
            return certain;
        }
        try0 = certain + free1;
        if(press(try0) == try0.size())
        {
            certain = try0;
            return certain;
        }
        certain = certain + free2;
    }
    return certain;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:70:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |         if(result == certain.size() + 2)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:72:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |             if(press(try0) == certain.size() + 2)
      |                ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:76:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         else if(result == certain.size() + 1)
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:81:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |             if(result0 == certain.size() + 1)
      |                ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:86:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |             else if(result0 == certain.size() + 2)
      |                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
combo.cpp:96:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   96 |     if(certain.size() < N)
      |        ~~~~~~~~~~~~~~~^~~
combo.cpp:99:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |         if(press(try0) == try0.size())
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:105:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |         if(press(try0) == try0.size())
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:33:5: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |     if(start == 'A')
      |     ^~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95