Submission #1007142

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007142		christinelynn	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
string guess_sequence ( int n ){
    string s = "";

    string temp = "AB";

    int y = press(temp);

    if ( y == 1 || y == 2 ){
        temp = "A";

        y = press ( temp );

        if ( y == 1 ) s = "A";
        else s = "B";
    }
    else{
        temp = "X";
        
        y = press ( temp );

        if ( y == 1 ) s = "X";
        else s = "Y";
    }

    for ( int i = 1; i <= n - 2; i++ ){
        string t1, t2, t3, t4;
        if ( s[0] == 'A' ){
            t1 = s; t1 += 'B';
            t2 = s; t2 += "XX";
            t3 = s; t3 += "XY";
            t4 = s; t4 += "XB";
            
            temp = t1 + t2 + t3 + t4;

            y = press ( temp );

            if ( y == s.length()) s += 'Y';
            else if ( y == s.length() + 1) s += 'B';
            else s += 'X';
        }
        else if ( s[0] == 'B'){
            t1 = s; t1 += 'A';
            t2 = s; t2 += "XX";
            t3 = s; t3 += "XY";
            t4 = s; t4 += "XA";

            temp = t1 + t2 + t3 + t4;

            y = press ( temp );

            if ( y == s.length()) s += 'Y';
            else if ( y == s.length() + 1) s += 'A';
            else s += 'X';
        }
        else if ( s[0] == 'X'){
            t1 = s; t1 += 'A';
            t2 = s; t2 += "BB";
            t3 = s; t3 += "BY";
            t4 = s; t4 += "BA";

            temp = t1 + t2 + t3 + t4;

            y = press ( temp );

            if ( y == s.length()) s +=  'Y';
            if ( y == s.length() + 1) s += 'A';
            if ( y == s.length() + 2 ) s += 'B';
        }
        else if ( s[0] == 'Y' ){
            t1 = s; t1 += 'B';
            t2 = s; t2 += "XB";
            t3 = s; t3 += "XA";
            t4 = s; t4 += "XX";            

            temp = t1 + t2 + t3 + t4;

            y = press ( temp );

            if ( y == s.length() ) s += 'A';
            if ( y == s.length() + 1)  s += 'B';
            if ( y == s.length() + 2 ) s += 'X';
        }
    }

    if ( s[0] == 'A' ){
        temp = "B";

        y = press(temp);

        if ( y == s.length() + 1) s += 'B';
        else{
            temp = "X";

            y = press ( temp );

            if ( y == s.length() + 1) s += 'X';
            else s += 'Y';
        }
    }
    else if ( s[0] == 'B' ){
        temp = "A";

        y = press ( temp );

        if ( y == s.length() + 1) s += 'A';
        else{
            temp = "X";
            
            y = press ( temp );

            if ( y == s.length() + 1) s += 'X';
            else s += 'Y';
        }
    }
    else if ( s[0] == 'X' ){
        temp = "A";

        y = press ( temp );

        if ( y == s.length() + 1) s += 'A';
        else{
            temp = "B";

            y = press ( temp );

            if ( y == s.length() + 1) s += 'B';
            else s += 'Y';
        }
    }
    else if ( s[0] == 'Y'){
        temp = "A";

        y = press ( temp );

        if ( y == s.length() + 1) s += 'A';
        else{
            temp = "B";

            y = press ( temp );

            if ( y == s.length() + 1) s += 'B';
            else s += 'X';
        }
    }

    return s;
}

Compilation message (stderr)

combo.cpp:3:1: error: 'string' does not name a type; did you mean 'stdin'?
    3 | string guess_sequence ( int n ){
      | ^~~~~~
      | stdin