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  1. Prepare
  2. Python
  3. Collections
  4. DefaultDict Tutorial
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DefaultDict Tutorial

  • kunagpal
     + 5 comments

    How about a sans list1 solution?

    from collections import defaultdict
d, n = defaultdict(list), list(map(int, input().split()))

for i in range(n[0]):
    d[input()].append(i + 1)

for i in range(n[1]):
    print(' '.join(map(str, d[input()])) or -1)