M elements of the array to selectively delete n,and eventually make the largest number left, how to delete Example: 45231, delete 2, leaving 531
一个n位的数，去掉其中的k位，问怎样去掉使得留下来的那个（n-k）位的数最大？
Brick409/interview1_DeleteNumber
M elements of the array to selectively delete n,and eventually make the largest number left, how to delete
C++