def find_even_index(array):
if isinstance(array, range):
return -1
for index, _ in enumerate(array):
if sum(array[:index+1]) == sum(array[index+2:]):
print(index)
return 0
find_even_index(range(100))
find_even_index(list(range(100)))
ZGVmIGZpbmRfZXZlbl9pbmRleChhcnJheSk6CglpZiBpc2luc3RhbmNlKGFycmF5LCByYW5nZSk6CgkJcmV0dXJuIC0xCglmb3IgaW5kZXgsIF8gaW4gZW51bWVyYXRlKGFycmF5KToKCQlpZiBzdW0oYXJyYXlbOmluZGV4KzFdKSA9PSBzdW0oYXJyYXlbaW5kZXgrMjpdKToKCQkJcHJpbnQoaW5kZXgpCgkJCXJldHVybiAwCgkJCQpmaW5kX2V2ZW5faW5kZXgocmFuZ2UoMTAwKSkKZmluZF9ldmVuX2luZGV4KGxpc3QocmFuZ2UoMTAwKSkp