Problem $1$

Consider the following function and answer questions.

void f$1($int n$)$

$\{$

if $($n$>0)$

$\{$

f$1($n$-1)$;

for $($int i$=0$; i$0)$

$\{$

f$2($n$-1,$ s$+1)$;

for $($int i$=0$; i