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ll check(string s, ll val) {
    ll rem = 0;
    for(int i = 0; i < s.size(); i++) {
        rem = rem * 10 + (s[i] - '0');
        rem %= val;
    }
    return rem;
}
void solve()
{
    ll n;
    cin >> n;
    string s = "2";
    for(int i = 2; i <= n; i++) {
        ll val = (1LL<<i);
        val = check(s, val);
        if(val == 0)
        s = "2" + s;
        else 
        s = "1" + s;
    }
    cout << s << '\n';
}

prog.cpp:1:1: error: ‘ll’ does not name a type
 ll check(string s, ll val) {
 ^~
prog.cpp: In function ‘void solve()’:
prog.cpp:11:5: error: ‘ll’ was not declared in this scope
     ll n;
     ^~
prog.cpp:12:5: error: ‘cin’ was not declared in this scope
     cin >> n;
     ^~~
prog.cpp:12:12: error: ‘n’ was not declared in this scope
     cin >> n;
            ^
prog.cpp:13:5: error: ‘string’ was not declared in this scope
     string s = "2";
     ^~~~~~
prog.cpp:13:5: note: suggested alternative: ‘struct’
     string s = "2";
     ^~~~~~
     struct
prog.cpp:15:11: error: expected ‘;’ before ‘val’
         ll val = (1LL<<i);
           ^~~~
           ;
prog.cpp:16:9: error: ‘val’ was not declared in this scope
         val = check(s, val);
         ^~~
prog.cpp:16:21: error: ‘s’ was not declared in this scope
         val = check(s, val);
                     ^
prog.cpp:16:15: error: ‘check’ was not declared in this scope
         val = check(s, val);
               ^~~~~
prog.cpp:22:5: error: ‘cout’ was not declared in this scope
     cout << s << '\n';
     ^~~~
prog.cpp:22:13: error: ‘s’ was not declared in this scope
     cout << s << '\n';
             ^

Standard output is empty