Mike and distribution cf-798D

cf - 798D Mike and distribution

Method: Sort a in descending order, b does not. The subscript of the largest a1 is output; then the loop is started from the sorted a2 in increments of 2. Because a1 is already the largest, no matter which one you choose, a2 and a3 are not as big as a1, so choose the one with the subscript to make b bigger, and so on. . . .
Therefore, the half with a and b larger is selected.