Find a number in sorted multidimentional array with binary search

Question

we got an increasing sorted multidimensional array for example:

int[][] mat = {{1,2,3,4},
{5,6,7,8},
{9,10,11,12},
{13,14,15,16}};

How can

Answer 1

There are different ways to define 'order' in a two-dimensional array. For the order in your example, do bin search on the first element of each row, to find the row, and then do bin search again inside the row. if the number of rows is >= than the number of columns, you can optimize doing binary search on the elements of the diagonal that starts at (0,0), then do another binary search on the rest of the row.