Submission #87130

#	Time	Username	Problem	Language	Result	Execution time	Memory
87130		solimm4sks	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

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

    int n = N;
    string str = "";
    char first;

    {
        int x, y;
        x = press("AB");
        y = press("BX");

        if(x == 0 && y == 0){
            first = 'Y';
        }
        if(x == 1 && y == 0){
            first = 'A';
        }
        if(x == 0 && y == 1){
            first = 'X';
        }
        if(x == 1 && y == 1){
            first = 'B';
        }
    }
    str += first;

    if(first == 'Y'){
        for(int i = 0; i < n - 1; ++i){
            int delta = str.size();
            int x = press(str + "A" + str + "BA" + str + "BB" + str + "BX");

            if(x - delta == 0){
                str += "X";
            }
            if(x - delta == 1){
                str += "A";
            }
            if(x - delta == 2){
                str += "B";
            }
        }
    }
    if(first == 'A'){
        for(int i = 0; i < n - 1; ++i){
            int delta = str.size();
            int x = press(str + "Y" + str + "BY" + str + "BB" + str + "BX");

            if(x - delta == 0){
                str += "X";
            }
            if(x - delta == 1){
                str += "Y";
            }
            if(x - delta == 2){
                str += "B";
            }
        }
    }
    if(first == 'X'){
        for(int i = 0; i < n - 1; ++i){
            int delta = str.size();
            int x = press(str + "A" + str + "BA" + str + "BB" + str + "BY");

            if(x - delta == 0){
                str += "Y";
            }
            if(x - delta == 1){
                str += "A";
            }
            if(x - delta == 2){
                str += "B";
            }
        }
    }
    if(first == 'B'){
        for(int i = 0; i < n - 1; ++i){
            int delta = str.size();
            int x = press(str + "A" + str + "XA" + str + "XX" + str + "XY");

            if(x - delta == 0){
                str += "Y";
            }
            if(x - delta == 1){
                str += "A";
            }
            if(x - delta == 2){
                str += "X";
            }
        }
    }

    return str;
}

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)