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

  • sean_wang_sq
     + 0 comments

    The statement of this problem is so confusing... spent most of my time figure out where does the m and n come from.. 

    from collections import defaultdict

n, m = map(int, input().split())

d = defaultdict(list)
for i in range(n):
    word = input()
    d[word].append(i + 1)

for j in range(m):
    word = input()
    if len(d[word]) > 0:
        print(' '.join([str(s) for s in d[word]]))
    else:
        print(-1)