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  1. Practice
  2. Data Structures
  3. Arrays
  4. Sparse Arrays
  5. Discussions

Sparse Arrays

  • polmki99 + 5 comments

    Python brofist! Here's my python.

    from collections import defaultdict

words = defaultdict(lambda: 0)

for _ in range(int(input().strip())):
    words[input().strip()] += 1
    
for _ in range(int(input().strip())):
    print(words[input().strip()])

    • Xarmanla + 0 comments

      Even python women wrote similar code. Now I will relearn sparse arrays.

    • hgnisrednivrug + 0 comments
      [deleted]

    • a2_darwazeh + 1 comment

      Wow i really went the hard route ay, forgot about dictionaries.

      import re

no_strings = int(input())
strings = []
no_q = 0
queries = []

for _ in range(no_strings):
    strings.append(input())

no_q = int(input())
for _ in range(no_q):
    queries.append(re.compile(r'^'+input()+'$'))

for pattern in queries:
    found = 0
    for s in strings:
        found += len(pattern.findall(s))
    print(found)

      • mounikavas + 0 comments

        Can you please explain your code

    • Arviy + 1 comment

      this will not work if you have queries with same element, as there was in test cases!

      • kakadiyaraj1999 + 0 comments

        it passes all the test cases :)

    • divedeeperintoai + 0 comments

      bro this doesnt allign to the solution given by the hackerrank