Add challenge 80: Grouped Query Attention (Medium) #81

	name: Check Challenge Indexes

	on:
	pull_request:
	paths:
	- 'challenges/**'

	jobs:
	check-index:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v3

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'

	- name: Check for duplicate indexes
	run: \|
	python - << 'EOF'
	import os
	import collections

	challenges_dir = "challenges"

	questions = collections.defaultdict(list)
	for folder in os.listdir(challenges_dir):
	folder_path = os.path.join(challenges_dir, folder)
	for question in os.listdir(folder_path):
	idx = question.split("_")[0]
	questions[idx].append(question)
	if len(questions[idx]) > 1:
	print(f"PR duplicated found: \n {questions[idx]}.")
	exit(1)
	EOF

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