from 双対セグメント木の下への伝搬 下への伝搬の影響範囲 python
>>> table = [0] * SEGTREE_SIZE
>>> down_propagate(table, up(5), lambda x,y: "+", "*")
>>> debugprint(table)
| * |
| * | + |
| + | * | 0 | 0 |
| 0 | 0 | * | + | 0 | 0 | 0 | 0 |
|0|0|0|0|+|+|0|0|0|0|0|0|0|0|0|0|