Leetcode Problem 1738. Find Kth Largest XOR Coordinate Value

1738. Find Kth Largest XOR Coordinate Value

Leetcode Solutions

Dynamic Programming and Priority Queue

  1. Initialize a 2D array dp with the same dimensions as matrix to store the XOR values.
  2. Iterate over the matrix to fill the dp array with the XOR of all elements from (0,0) to (i,j).
  3. Use the property that a ^ a = 0 and a ^ 0 = a to compute the XOR values efficiently.
  4. Initialize a min-heap priority queue to store the k largest XOR values.
  5. Iterate over the dp array and for each value:
    • If the priority queue size is less than k, add the value to the queue.
    • If the priority queue size is equal to k and the current value is greater than the smallest value in the queue, replace the smallest value with the current value.
  6. After processing all values, the top of the priority queue will be the kth largest value.
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Brute Force with Sorting

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