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1248. Count Number of Nice Subarrays #259

Answered by mah-shamim
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The problem requires finding the number of subarrays in an integer array nums that contain exactly k odd numbers. Subarrays are contiguous, and we need to optimize for performance due to constraints on the size of the array.

Key Points:

  1. Continuous Subarrays: The solution must consider only contiguous parts of the array.
  2. Odd Numbers Identification: Odd numbers can be identified by checking if num % 2 != 0 or using bitwise operation num & 1.
  3. Constraints:
    • Array size can be up to 50,000, so a brute-force approach (checking all possible subarrays) would be too slow.
  4. Optimal Solution:
    • Using prefix sums or a sliding window approach efficiently counts the valid subarrays.

Approach:

The pr…

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2 replies
@basharul-siddike
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@mah-shamim
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mah-shamim Jan 11, 2025
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Answer selected by basharul-siddike
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