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Implement an algorithm to delete a node in the middle of a singly linked list, given only access to that node. Example Given 1->2->3->4, and node 3. r 阅读全文
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The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1" or 11. 11 is read o 阅读全文
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Count how many 1 in binary representation of a 32-bit integer. Example Given 32, return 1 Given 5, return 2 Given 1023, return 9 Challenge If the inte 阅读全文
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Cosine similarity is a measure of similarity between two vectors of an inner product space that measures the cosine of the angle between them. The cos 阅读全文
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Given a sorted (increasing order) array, Convert it to create a binary tree with minimal height. Example Given [1,2,3,4,5,6,7], return 4 / \ 2 6 / \ / 阅读全文
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Compare two strings A and B, determine whether A contains all of the characters in B. The characters in string A and B are all Upper Case letters. Exa 阅读全文