1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
Youaregivenanm*nmatrix,mat,andanintegerk,whichhasitsrowssortedinnon-decreasingorder.Youareallowedtochooseexactly1elementfromeachrowtoformanarray.ReturntheKthsmallestarraysumamongallpossiblearrays.Exam