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Saved 2 bytes thanks to my pronoun is monicareinstate!!!
f(n,a,l,s,i)int*a;{for(s=i=!n;i<l&n>0;)s+=f(n-a[i++],a,l);n=s;}
Try it online!Try it online!
Try it online!
f(n,a,l,s,i)int*a;{for(s=s=i=!n,i=0;i<l&n>0;n;i<l&n>0;)s+=f(n-a[i++],a,l);n=s;}
f(n,a,l,s,i)int*a;{for(s=!n,i=0;i<l&n>0;)s+=f(n-a[i++],a,l);n=s;}
