Submission #864031

#	Time	Username	Problem	Language	Result	Execution time	Memory
864031		dpsaveslives	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;
string guess_sequence(int N){
    vector<int> mp = {'A','B','X','Y'};
    string s = ""; int p;
    int r = press("AB");
    if(r == 0){
        r = press("X");
        if(r == 0){
            s += "Y";
            p = 3;
        }
        else{
            s += "X";
            p = 2;
        }
    }
    else if(r == 1){
        r = press("A");
        if(r == 0){
            s += "B";
            p = 1;
        }
        else{
            s += "A";
            p = 0;
        }
    }
    else{
        p = 0;
        s += "A";
    }
    for(int i = 1;i<N;++i){
        string cur = "";
        for(int j = 0;j<4;++j){
            if(j != p){
                cur += s; cur += mp[(p+1)%4];
                cur += mp[j];
            }
        }
        cur += s; cur += mp[(p+2)%4];
        int r = press(cur);
        if(r == i){
            s += mp[(p+3)%4];
        }
        else if(r == i+1){
            s += mp[(p+2)%4];
        }
        else{
            s += mp[(p+1)%4];
        }
        cout << s << "\n";
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:6:13: error: 'press' was not declared in this scope
    6 |     int r = press("AB");
      |             ^~~~~