Leetcode Problem 1424. Diagonal Traverse II

1424. Diagonal Traverse II

Leetcode Solutions

Initialize a hash map groups to store lists of elements, keyed by their diagonal identifier (sum of row and column indices).
Iterate over the rows of nums from the last row to the first row.
For each element in a row, calculate its diagonal identifier and append the element to the corresponding list in groups.
Initialize an empty list ans to store the final diagonal order.
Iterate over the keys in groups in ascending order, appending each group's elements to ans.
Return the list ans.

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