https://blog.youkuaiyun.com/hign_ploymerzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/hign_ploymer/article/details/149296307https://blog.youkuaiyun.com/hign_ploymer/article/details/149296307hign_ploymerSat, 12 Jul 2025 17:28:49 +0800index)是离散化的本质，建立了一段数列到自然数之间的映射关系。离散化的本质是将数字本身key映射为它在数组中的索引index(1 based)。首先右移n位 再与 1 进行 & 运算 结果无非是1 或 0。结果为 1000 返回的为最后一个 1 开始的数。笔记： 若想获取某个数字的第 n-1 位。假设 x 的原码是 011001000。位不为 1 时，我们可以注意到，如果将。-x在二进制里表示为 ~x+1。加一之后 100111000。个二进制位的十进制结果。]]>https://blog.youkuaiyun.com/hign_ploymer/article/details/149151420https://blog.youkuaiyun.com/hign_ploymer/article/details/149151420hign_ploymerSun, 06 Jul 2025 12:10:37 +0800https://blog.youkuaiyun.com/hign_ploymer/article/details/148869748https://blog.youkuaiyun.com/hign_ploymer/article/details/148869748hign_ploymerTue, 24 Jun 2025 16:21:23 +0800