View Compilation Error

0_0_33855281_8421.cpp:4:1: error: 'll' does not name a type
 ll gcd(ll x, ll y){ return y?gcd(y, x%y):x;}
 ^
0_0_33855281_8421.cpp: In function 'int main()':
0_0_33855281_8421.cpp:11:66: error: 'gcd' was not declared in this scope
             ans[i][j] = max(ans[i-1][j], ans[i][j-1]) + (gcd(i, j)==1);
                                                                  ^