Submission #497220

#	Time	Username	Problem	Language	Result	Execution time	Memory
497220		saarang123	Combo (IOI18_combo)	C++17	100 / 100	30 ms	740 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;

string guess_sequence(int N) {
    string s;
    if(press("AB")) 
        s = press("A") ? "A" : "B";
    else 
        s = press("X") ? "X" : "Y";

    if(N == 1)
        return s;
    
    vector<char> left;
    string original = "ABXY";
    for(char c : original)
        if(c != s[0])
            left.push_back(c);

    for(int i = 1; i < N - 1; i++) {
        string query = (s + left[0]) + (s + left[1] + left[0]) 
                        + (s + left[1] + left[1]) + (s + left[1] + left[2]);
        int res = press(query);
        if(res == s.size())
            s += left[2];
        else if(res == s.size() + 1)
            s += left[0];
        else
            s += left[1];
    }

    if(press(s + left[0] + s + left[1]) == s.size())
        s += left[2];
    else 
        s += (press(s + left[0]) == s.size() + 1) ? left[0] : left[1];

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:25:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         if(res == s.size())
      |            ~~~~^~~~~~~~~~~
combo.cpp:27:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         else if(res == s.size() + 1)
      |                 ~~~~^~~~~~~~~~~~~~~
combo.cpp:33:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     if(press(s + left[0] + s + left[1]) == s.size())
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
combo.cpp:36:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         s += (press(s + left[0]) == s.size() + 1) ? left[0] : left[1];
      |               ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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