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转自：https://blog.csdn.net/bitcarmanlee/article/details/51589143 在一篇博客中看到单变量线性回归可以使用最小二乘或者递归下降来求解，最小二乘就是最小化平方误差，解决最优化问题。 但是对其具体的过程还不是很理解，所以来总结学习一下。 1.最小 阅读全文
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转自：https://mp.weixin.qq.com/s/oZVj8lxJH6ZqL4sGCXuxMw The Tower of Babylon（巴比伦塔） Perhaps you have heard of the legend of the Tower of Babylon. Nowadays 阅读全文
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Formation is very important when taking a group photo. Given the rules of forming K rows with N people as the following: The number of people in each 阅读全文
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If a machine can save only 3 significant digits, the float numbers 12300 and 12358.9 are considered equal since they are both saved as 0.123×105 wi 阅读全文
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A supply chain is a network of retailers（零售商）, distributors（经销商）, and suppliers（供应商）-- everyone involved in moving a product from supplier to customer 阅读全文
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Given a sequence of positive numbers, a segment is defined to be a consecutive subsequence. For example, given the sequence { 0.1, 0.2, 0.3, 0.4 }, we 阅读全文
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问题：如何求一个数二进制中的1的个数？ 转自：https://blog.csdn.net/smile_zhangw/article/details/79532119 1.首先需要明确的是，一个数，可为正可为负，对正数来说，可以使用&1，>>1的操作； 但是对于负数来说，负数在内存中存在的是补码，如果 阅读全文
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转自：https://blog.csdn.net/flushhip/article/details/79165701#commentBox 1.首先其中讲到了一个问题，就是如何求一个数的二进制表示的最末位的1. 用这个即可。假设x=5,那么x的二进制就是0101,-x的二进制1011.（负数补码是除 阅读全文
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1057 Stack (30)（30 分） Stack is one of the most fundamental data structures, which is based on the principle of Last In First Out (LIFO). The basic ope 阅读全文
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A family hierarchy is usually presented by a pedigree tree where all the nodes on the same level belong to the same generation. Your task is to find t 阅读全文