DefaultDict Tutorial in Python - HackerRank Solution
Problem :
The defaultdict tool is a container in the collections class of Python. It's
similar to the usual dictionary (dict) container, but the only difference is
that a defaultdict will have a default value if that key has not been set yet.
If you didn't use a defaultdict you'd have to check to see if that key exists,
and if it doesn't, set it to what you want.
For Example :
from collections import defaultdict d = defaultdict(list) d['python'].append("awesome") d['something-else'].append("not relevant") d['python'].append("language") for i in d.items(): print i
This prints :
('python', ['awesome', 'language']) ('something-else', ['not relevant'])
In this challenge, you will be given 2 integers, n and m. There are n words,
which might repeat, in word group A. There are m words belonging to word group
B. For each m words, check whether the word has appeared in group A or not.
Print the indices of each occurrence of m in group A. If it does not appear,
print -1.
Constraints :
- 1 <= n <= 10000
- 1 <= m <= 100
- 1 <= length of each word in the input <= 100
Input Format :
The next n lines contains the words belonging to group A.
The next m lines contains the words belonging to group B.
Output Format :
The ith line should contain the 1-indexed positions of the occurrences of the
ith word separated by spaces.
Sample Input :
5 2 a a b a b a b
Sample Output :
1 2 4 3 5
Explanation :
'b' appeared 2 times in positions 3 and 5.
In the sample problem, if 'c' also appeared in word group B, you would print -1.
Solution :
# DefaultDict Tutorial in Python - Hacker Rank Solution # Python 3 # Enter your code here. Read input from STDIN. Print output to STDOUT # DefaultDict Tutorial in Python - Hacker Rank Solution START from collections import defaultdict n, m = map(int,input().split()) a = defaultdict(list) for i in range(1, n + 1): a[input()].append(i) for i in range(1, m + 1): key = input() if len(a[key]) > 0: print(" ".join(str(c) for c in a[key])) else: print(-1) # DefaultDict Tutorial in Python - Hacker Rank Solution END
the above hole problem statement is given by hackerrank.com but the solution is generated by the codeworld19 authority if any of the query regarding this post or website fill the following contact form thank you.
CodeWorld19
Hey, I am Parthe Omkar
I think we can also use for i in range(m):
There is no need to use for i in range(1,m+1):