Submission #1020732

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020732		ZanP	Combo (IOI18_combo)	C++17	0 / 100	0 ms	344 KiB

combo

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
 
int press(string p);
// {
//     cout << p << '\n';
//     int a; cin >> a;
//     return a;
// }
 
int n;
string z;
string p;
void make_bases()
{
    if(z[0] == 'A'){
        p = "XYB";
    } else if(z[0] == 'B') {
        p = "AXY";
    } else if(z[0] == 'X'){
        p = "ABY";
    } else if(z[0] == 'Y'){
        p = "ABX";
    }
}
 
string guess_sequence(int N)
{
    n = N;
    z.reserve(n);
    int a = press("AB");
    if(a == 2){z = "AB";}
    else if(a == 1){
        if(press("A")){
            z = "A";
        }else{
            z = "B";
        }
    }else{
        if(press("X")){
            z = "X";
        }else{
            z = "Y";
        }
    }
    make_bases();
    while(true)
    {
        string ask = z;
        ask.push_back(p[0]);
        for (int i = 0; i<3;i++){
            ask.append(z);
            ask.push_back(p[1]);
            ask.push_back(p[i]);
        }
        a = press(ask);
        if(a == z.size())
        {
            z.push_back(p[2]);
        }
        else if(a == z.size()+1)
        {
            z.push_back(p[0]);
        }
        else
        {
            z.push_back(p[1]);
        }

        if(z.size() == n-1){break;}
    }
    for (int i = 0; i<2; i++)
    {
        string ask = z;
        ask.push_back(p[i]);
        a = press(ask);
        if(a == n) return ask; 
    }
    z.push_back(p[2]);
    return z;
}

// int main()
// {
//     int x; cin >> x; cout << guess_sequence(x) << '\n';
//     return 0;
// }

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:60:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         if(a == z.size())
      |            ~~^~~~~~~~~~~
combo.cpp:64:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |         else if(a == z.size()+1)
      |                 ~~^~~~~~~~~~~~~
combo.cpp:73:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   73 |         if(z.size() == n-1){break;}
      |            ~~~~~~~~~^~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95