Submission #673578

#	Time	Username	Problem	Language	Result	Execution time	Memory
673578		tbzard	Combo (IOI18_combo)	C++14	0 / 100	1 ms	288 KiB

combo

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

int press(string s);
string guess_sequence(int n){
    string ans = "";
    string s[4] = {"A", "B", "X", "Y"};

    int sum = press(s[0]+s[1]);
    if(sum == 0){
        sum = press(s[2]);
        if(sum == 1) ans += s[2], swap(s[2], s[3]);
        else ans += s[3];
    }
    else if(sum == 1){
        sum = press(s[0]);
        if(sum == 1) ans += s[0], swap(s[0], s[3]);
        else ans += s[1], swap(s[1], s[3]);
    }
    else{
        ans += s[0]+s[1];
        swap(s[0], s[3]);
    }
    while(ans.length() != n){
        int m = ans.length();
        sum = press(ans+s[0] + ans+s[1]+s[0] + ans+s[1]+s[1] + ans+s[1]+s[2]);
        if(sum == m+1){
            if(m+1 == n){
                sum = press(ans+s[0]);
                if(sum == n) ans += s[0];
                else ans += s[1];
            }
            else ans += s[0];
        }
        else if(sum == m+2) ans += s[1];
        else ans += s[2];
    }

    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:24:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |     while(ans.length() != n){
      |           ~~~~~~~~~~~~~^~~~

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