Discard old data — evict what's already buffered to make room
* @param arr 待排序数组
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'We have a new major number purely because I'm easily confused and not good with big numbers' says Linus Torvalds about Linux 7.0
Where to buy Pokémon FireRed and LeafGreen for Nintendo Switch:
这里用的是 平行光，模拟太阳光。