Greedy algorithoms--activity

n=5
s = [1,3,0,5,3,5,6,8,8,2,12]
f = [4,5,6,7,8,9,10,11,12,13,14]
a =[False, False, False, False, False, False, False, False, False, False, False ]
_list = zip(s,f)
print _list
def greedySelect(n, s, f, a):
 a[0]=True
 j = 0
 for i in range(0,11):
  if s[i] > f[j]:
   a[i] = True
   j = i
  
greedySelect(11, s, f,a)
print a