What are the two factors which contribute to the inefficiency of some recursive solutions?

Which browser has stopped using favicons?

a. Internet Explorer b. Firefox c. Safari d. iOS

What is the output of the following code fragment?

int f1(int n, int m) { if(n < m) return 0; else if(n==m) return m+ f1(n-1,m); else return n+ f1(n-2,m-1); } int main() { cout << f1(5,4); return 0; } a. 0 b. 2 c. 4 d. 8 e. infinite recursion