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Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c 阅读全文
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You are given n pairs of numbers. In every pair, the first number is always smaller than the second number. Now, we define a pair (c, d) can follow an 阅读全文
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In LeetCode Store, there are some kinds of items to sell. Each item has a price. However, there are some special offers, and a special offer consists 阅读全文
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Given a non empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Note: The range of node’s value 阅读全文
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Given an integer array, find three numbers whose product is maximum and output the maximum product. Example 1: Example 2: Note: The length of the give 阅读全文
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Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n 阅读全文