- 父节点i的左子: 2*i+1, 右子: 2*i+2
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You can find ergonomic keyboards with and without number pads. Not having those number keys on the right hand side lets you keep your mouse closer in, minimizing overall reach. But if you work with numbers a lot, you’ll likely want that pad included. Some programmable boards allow for the use of layers, which temporarily repurpose keys and can provide you with a ten-key option through clever remapping of letter keys.