You are given an m x n matrix mat that has its rows sorted in non-decreasing order and an integer k.
You are allowed to choose exactly one element from each row to form an array.
\n\nReturn the kth smallest array sum among all possible arrays.
\n
Example 1:
\n\n\nInput: mat = [[1,3,11],[2,4,6]], k = 5\nOutput: 7\nExplanation: Choosing one element from each row, the first k smallest sum are:\n[1,2], [1,4], [3,2], [3,4], [1,6]. Where the 5th sum is 7.\n\n\n
Example 2:
\n\n\nInput: mat = [[1,3,11],[2,4,6]], k = 9\nOutput: 17\n\n\n
Example 3:
\n\n\nInput: mat = [[1,10,10],[1,4,5],[2,3,6]], k = 7\nOutput: 9\nExplanation: Choosing one element from each row, the first k smallest sum are:\n[1,1,2], [1,1,3], [1,4,2], [1,4,3], [1,1,6], [1,5,2], [1,5,3]. Where the 7th sum is 9. \n\n\n
\n
Constraints:
\n\nm == mat.lengthn == mat.length[i]1 <= m, n <= 401 <= mat[i][j] <= 50001 <= k <= min(200, nm)mat[i] is a non-decreasing array.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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