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集成学习属于机器学习的算法模型、模型融合属于数据挖掘多个模型得到结果的融合，但他们本质是一样的都是为了使用多个基本模型来提高泛化能力。放在一起统一的讲一讲。 为什么多模型能带来更好效果呢？ 《机器学习》（周志华）一书从三个角度给出了学习器的结合带来的三个好处： 从统计上来说，由于假设空间很大，可能有 阅读全文
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Description: Implement int sqrt(int x). Compute and return the square root of x. 解题思路： 直接利用牛顿迭代法进行解答，数值阈为0.0001，代码如下 class Solution {public: int mySqr 阅读全文
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Description: Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If 阅读全文
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Description: Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the 阅读全文
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Description: Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. p 阅读全文
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Description: We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an int 阅读全文
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Description: The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x 阅读全文
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Description: Determine whether an integer is a palindrome. Do this without extra space. Difficulty: Easy palindrome的意思是回数，即数字顺序颠倒后仍和原数字相等的数字。 引用百度百科的定 阅读全文
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Description: Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do n 阅读全文
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Description: Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. Note:The input is assu 阅读全文