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

  • vmmulik
     + 0 comments

    Here is my code

    from collections import defaultdict

n, m = input().split()

result = defaultdict(list)

for index, _ in enumerate(range(int(n)),1):
    val = input()
    # result[val] = result[val].append(index) if val in result else [index]
    result[val].append(index)
    
for _ in range(int(m)):
    b_val = input()
    if b_val in result:
        print(*result[b_val])
    else:
        print(-1)