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while learning: git commit -m "build" def grow(): return success class Student:
87%
binary_search.py
1# Challenge: Implement binary search
2def binary_search(arr, target):
3    low, high = 0, len(arr) - 1
4    while low <= high:
5        mid = (low + high) // 2
6        if arr[mid] == target:
7            return mid
8        elif arr[mid] < target:
9            low = mid + 1
✦ AI Hint
Think about the O(log n) time complexity. What happens when arr[mid] > target?

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▸ python -m pytest solution.py

Running test suite...

✓ test_empty_array 2ms
✓ test_single_element 1ms
✓ test_target_at_start 1ms
✓ test_target_at_end 2ms
✓ test_large_dataset 4ms
✓ test_negative_numbers 1ms
✕ test_duplicate_values 3ms

6/7 passed · 14ms total

⚡ AI: You're close! Think about what happens when multiple elements match. Should you return the first or last occurrence?
Progress
87% complete

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