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from typing import NamedTuple
class Range(NamedTuple):
start: int
length: int
def from_indexes(indexes):
ranges = []
curr_range_start = 0
curr_range_len = 0
last_index = -1
for index in sorted(indexes):
if index == curr_range_start + curr_range_len:
curr_range_len += 1
else:
if curr_range_len > 0:
ranges.append(Range(
start = curr_range_start,
length = curr_range_len))
curr_range_start = index
curr_range_len = 1
if curr_range_len > 0:
ranges.append(Range(
start = curr_range_start,
length = curr_range_len))
return ranges
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