Submission #164708

#	Time	Username	Problem	Language	Result	Execution time	Memory
164708		IgorI	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <iostream>
#include <string>
using namespace std;
typedef long long ll;

string guess_sequence(int n)
{
    string s;
    int r = press("AB");
    if (r)
    {
        int q = press("A");
        if (q) s += "A";
        else s += "B";
    } else {
        int q = press("X");
        if (q) s += "X";
        else s += "Y";
    }
    for (int i = 1; i < n; i++)
    {
        string r;
        int q;
        if (s[0] == 'A') r = s + "BB" + s + "BX" + s + "BY" + s + "X";
        if (s[0] == 'B') r = s + "AA" + s + "AX" + s + "AY" + s + "X";
        if (s[0] == 'X') r = s + "AA" + s + "AB" + s + "AY" + s + "B";
        if (s[0] == 'Y') r = s + "AA" + s + "AB" + s + "AX" + s + "B";
        q = press(r) - i;
        if (s[0] == 'A') if (q == 0) s += "Y"; else if (q == 1) s += "X"; else if (q == 2) s += "B";
        if (s[0] != 'A')
        {
            if (q == 2) s += "A";
            if (s[0] == 'B') if (q == 0) s += "Y"; else if (q == 1) s += "X";
            if (s[0] != 'B')
            {
                if (q == 1) s += "B";
                if (s[0] == 'X') if (q == 0) s += "Y";
                if (s[0] != 'X')
                {
                    if (q == 0) s += 'X';
                }
            }
        }
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:9:13: error: 'press' was not declared in this scope
    9 |     int r = press("AB");
      |             ^~~~~
combo.cpp:29:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   29 |         if (s[0] == 'A') if (q == 0) s += "Y"; else if (q == 1) s += "X"; else if (q == 2) s += "B";
      |            ^
combo.cpp:33:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   33 |             if (s[0] == 'B') if (q == 0) s += "Y"; else if (q == 1) s += "X";
      |                ^