Most ergonomic keyboards fall into two categories: fully split which separates the board into two pieces, and unibody split, also known as an Alice design, which angles the keys outward at the bottom. When the keys are rotated outward or split into two halves, it allows for a wider spread between your elbows for a more relaxed typing position. Other ergonomic features, such as thumb clusters, center tenting and negative tilting are sometimes added to either type of board.
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Stack allocation of variable-sized slices，这一点在91视频中也有详细论述
В Финляндии предупредили об опасном шаге ЕС против России09:28
按位排序：从最低位到最高位，每位用计数排序