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- import sys
- from collections import defaultdict
- fname = sys.argv[1]
- with open(fname) as fin:
- data = defaultdict(list)
- for line in fin:
- x,y = line.split()
- data[int(x)].append(float(y))
- for k,v in sorted(data.items()):
- for i,elem in enumerate(v):
- print i,elem
- print
- print
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