Algorithm
Problem Name: Python -
In this HackerRank Functions in PYTHON problem solution,
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.
Example
Group A contains 'a', 'b', 'a' Group B contains 'a', 'c'
For the first word in group B, 'a', it appears at positions 1 and 3 in group A. The second word, 'c', does not appear in group A, so print -1.
Expected output:
1 3
-1
Input Format
The first line contains integers, n and m separated by a space.
The next n lines contains the words belonging to group A.
The next m lines contains the words belonging to group B.
Constraints
1 <= n <= 10000
1 <= m <= 100
1 <= length of the each word input <= 100
Output Format
Output m lines.
The i**th line should contain the 1-indexed positions of the occurrences of the
word separated by spaces.
Sample Input
STDIN Function ----- -------- 5 2 group A size n = 5, group B size m = 2 a group A contains 'a', 'a', 'b', 'a', 'b' a b a b a group B contains 'a', 'b' b
Sample Output
1 2 4
3 5
Explanation
'a' appeared 3 times in positions 1, 2 and 4.
'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.
Code Examples
#1 Code Example with Python Programming
Code -
Python Programming
from collections import defaultdict
n, m = map(int, (input().split()))
d = defaultdict(list)
for idx in range(1,n+1):
d[input()].append(idx)
for _ in range(m):
word = input()
if word in d.keys():
print(*d[word])
else:
print(-1)