flood2:
RRUDRRULURULLLDDLDW  ==> broken
RRUDRRULURULLLDDLDL  ==> safe escape

if air==0 && reach_open_lifting is the same timing, it is safe.

flood2:
UUURWWWWWWWWWWWWWWWWWWRWWWWWW ==> -4 broken
UUURWWWWWWWWWWWWWWWWWWRWWWWWR ==> 21 broken

if air==0 && get_lamdba is the same timing, you get the lambda.

contest8:
UUUUUUU ==> safe
UUUUUUW ==> broken

if you go up and blocked rock from falling down, it is safe.