Submission #636983

#	Time	Username	Problem	Language	Result	Execution time	Memory
636983		bonk	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

string guess_sequence(int n){
    char fi = ' ';
    if(press("A")) fi = 'A';
    else if(press("B")) fi = 'B';
    else if(press("X")) fi = 'X';
    else fi = 'Y';

    string ans = "";
    ans += fi;
    int len = 1;

    while(len < n){
        if(fi != 'A' && (press(ans + 'A')) == len + 1) ans += 'A';
        else if(fi != 'B' && (press(ans + 'B')) == len + 1) ans += 'B';
        else if(fi != 'X' && (press(ans + 'X')) == len + 1) ans += 'X';
        else ans += 'Y';
        len++;
    }

    return ans;
}

Compilation message (stderr)

combo.cpp:1:1: error: 'string' does not name a type
    1 | string guess_sequence(int n){
      | ^~~~~~