DefaultDict Tutorial Answer

This Python script demonstrates the use of defaultdict from the collections module. It takes two integers as input, followed by a series of words. The script then maps each word to its index and prints these indices for a given set of words.

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The script uses defaultdict from the collections module in Python. It initializes a defaultdict with list as the default factory. It then takes two integers as input, 'n' and 'm'. For 'n' times, it takes a word as input and appends its index (1-indexed) to the defaultdict entry for that word. For 'm' times, it takes a word as input and prints the indices of that word in the previous list of words. If the word is not found, it prints -1. The key approach here is the use of defaultdict which allows to append to a list for each word without initializing the list explicitly.


from collections import defaultdict

d = defaultdict(list)
n, m = map(int, input().split())
for i in range(n):
    w = input()
    d[w].append(str(i + 1))
for _ in range(m):
    w = input()
    print(" ".join(d[w]) or -1)

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