help ~

my WA on test 30 was because, I forgot:
"If the pointer before increment points to the rightmost byte of the array, then after increment it points to the leftmost byte."
and
"If the pointer before decrement points to the leftmost byte of the array, then after increment it points to the rightmost byte."

In the statement it is said, that you may assume to use at most 4 bytes, but it is not said WHICH four bytes.. In the case of test 30, the best four are the rightmost one and the three leftmost.

However, now I'm stuck on 31...

Yes!Thank.But I resolved this situation in array[4] but
moving initial position in second cell.