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多线程 from:https://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000/001386832360548a6491f20c62d427287739fcfa5d5be1f000 import 阅读全文
posted @ 2018-03-28 17:02
bonelee
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Find the sum of all left leaves in a given binary tree. Example: 更简洁的写法： 迭代解法： 另外也可以在迭代过程中绕过叶子结点： 阅读全文
posted @ 2018-03-27 23:23
bonelee
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Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally ident 阅读全文
posted @ 2018-03-27 22:55
bonelee
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Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the rans 阅读全文
posted @ 2018-03-27 22:36
bonelee
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Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may comple 阅读全文
posted @ 2018-03-27 22:18
bonelee
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Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. Roman Numerals Chart M=1000 D = 500 I 1 XX 阅读全文
posted @ 2018-03-27 21:23
bonelee
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import re pattern = re.compile( r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|' r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|' r'([a-zA-Z0-9][-_.a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.' r'([a... 阅读全文
posted @ 2018-03-27 12:01
bonelee
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Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the 阅读全文
posted @ 2018-03-26 23:25
bonelee
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An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535). Given a coordinate (sr, 阅读全文
posted @ 2018-03-26 23:22
bonelee
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https://blog.csdn.net/qtlyx/article/details/50780400 最后的效果就是这样的。很明显可以看到，左下角那个有点像三角函数的关系，Pearson系数(就是线性相关系数)为0，而MIC则有0.8。 摘自：http://tech.ifeng.com/a/20 阅读全文
posted @ 2018-03-26 16:11
bonelee
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