Leetcode Problem 533. Lonely Pixel II

533. Lonely Pixel II

Leetcode Solutions

Counting Black Lonely Pixels with Row and Column Validation

  1. Initialize a hashmap to store row signatures and their counts.\n2. Initialize an array to count black pixels in each column.\n3. Iterate over each row:\n a. Count the number of black pixels in the row.\n b. If the count is target, create a signature string for the row.\n c. Increment the count of the signature in the hashmap.\n d. Increment the column count for each black pixel.\n4. Initialize a result counter to 0.\n5. Iterate over the hashmap:\n a. If a signature count is target, iterate over the columns:\n i. If a column has target black pixels and the pixel at the current row is black, increment the result by target.\n6. Return the result.
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Brute Force Check for Lonely Black Pixels

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