1
Python 3, 318
def s(f,z):
p=b="";g=0;a=[];n=a.append;n(p)
for i in f:
if i=="\n":n(p);p=''
else:p+=i
n(p);p=b;n(p)
while g<len(a):
if'<'in a[g]:q=g;a[q]=a[q][:-1]
g+=1
while 1:
v=a[q]
if v=='':print(b);break
if v[-1]=='1':a[q]=v[:-1];q+=1;b=1
elif v[-1]=="0":a[q]=v[:-1];q-=1...