Submission #220618

#	Time	Username	Problem	Language	Result	Execution time	Memory
220618		Coroian_David	Combo (IOI18_combo)	C++11	Compilation error	0 ms	0 KiB

combo

std::string guess_sequence(int N) {
    using namespace std;

    string s;
    s.clear();

    char ch[4] = {'A', 'B', 'X', 'Y'};

    int poz = 0;
    int x = press("AB");
    cout << "INTREB AB  REZ = " << x << "\n";
    if(x >= 1)
    {
        int y = press("A");
        poz = (y == 1 ? 0 : 1);
    }

    else
    {
        int y = press("X");
        poz = (y == 1 ? 2 : 3);
    }

    swap(ch[0], ch[poz]);

    s.resize(1);
    s[0] = ch[0];


    string a;
    a.clear();
    for(int i = 1; i < N - 1; i ++)
    {
        a = s + ch[2] +
            s + ch[3] + ch[1] +
            s + ch[3] + ch[2] +
            s + ch[3] + ch[3];


        int x = press(a) - i;
        s.resize(i + 1);
        s[i] = ch[1 + x];
    }

    x = press(s + ch[1] + s + ch[2]);
    if(x == N)
    {
        int y = press(s + ch[1]);
        s.resize(N);
        s[N - 1] = (y == N ? ch[1] : ch[2]);
    }

    else
    {
        s.resize(N);
        s[N - 1] = ch[3];
    }

    return s;
}

Compilation message (stderr)

combo.cpp:1:6: error: 'string' in namespace 'std' does not name a type
    1 | std::string guess_sequence(int N) {
      |      ^~~~~~
combo.cpp:1:1: note: 'std::string' is defined in header '<string>'; did you forget to '#include <string>'?
  +++ |+#include <string>
    1 | std::string guess_sequence(int N) {