| 31 | ################################################################################ |
| 32 | |
| 33 | class MEM: |
| 34 | |
| 35 | def __init__(self): |
| 36 | self.mem = {} |
| 37 | self.pos = 0 |
| 38 | |
| 39 | def get(self): |
| 40 | if self.pos in self.mem: |
| 41 | return self.mem[self.pos] |
| 42 | return 0 |
| 43 | |
| 44 | def set(self, value): |
| 45 | if value: |
| 46 | self.mem[self.pos] = value |
| 47 | elif self.pos in self.mem: |
| 48 | del self.mem[self.pos] |
| 49 | |
| 50 | def inc(self): |
| 51 | self.pos += 1 |
| 52 | |
| 53 | def dec (self): |
| 54 | self.pos -= 1 |
| 55 | |
| 56 | ################################################################################ |
| 57 |