Submission #526668

#	Time	Username	Problem	Language	Result	Execution time	Memory
526668		lcs147	Combo (IOI18_combo)	C++17	30 / 100	47 ms	468 KiB

combo

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

string guess_sequence(int n) {
    set<char> possible = {'A','B','X','Y'};

    string res;
    while(res.size() < n) {
        auto possible2 = possible;

        char last = *prev(possible.end());
        possible.erase(last);
        
        char cur = last;
        for(char c:possible) {
            if(press(res+c) == res.size()+1) {
                cur = c;
                break;
            }
        }
        res += cur;

        possible = possible2;
        if(res.size() == 1) possible.erase(cur);
    }
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:9:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |     while(res.size() < n) {
      |           ~~~~~~~~~~~^~~
combo.cpp:17:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |             if(press(res+c) == res.size()+1) {
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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