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#!/usr/bin/python -u
from __future__ import print_function
import heapq
def file_iter(fil):
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the_line = 0
while the_line != '':
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next_line = fil.readline().strip()
if next_line != '':
# yield int(next_line)
yield next_line
the_line = next_line
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def sorter(gen, len_):
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the_buffer = []
for the_line in gen:
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# print("pushing: ", the_line)
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heapq.heappush(the_buffer, the_line)
if len(the_buffer) == len_:
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# print("buffer_before: ", repr(the_buffer))
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yield heapq.heappop(the_buffer)
# print("buffer_after: ", repr(the_buffer))
while the_buffer != []:
yield heapq.heappop(the_buffer)
# print("buffer_after: ", repr(the_buffer))
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if __name__ == '__main__':
import sys
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for line in sorter(file_iter(sys.stdin), int(sys.argv[1])):
print(line)
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