OJ Board

hi. i am a bit confused on the problem. seems like the problem is asking what is the subtration or additions one have to do. But from what I understand, shouldn't it be only 3 moves?

5 2 4 1 7 5

1 2 3 4 5 6 <col>
avg is 4 so
column moving
7 -> 4 (3blks)
1 -> 2 (1blk)
6 -> 2 (1blk)

3 moves.

Is ...