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Description Given an array of non negative integers, half of the integers in A are odd, and half of the integers are even. Sort the array so that when 阅读全文
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Description A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. Example 1 阅读全文
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Description In a array of size , there are unique elements, and exactly one of these elements is repeated N times. Return the element repeated times. 阅读全文
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Description Given an array of integers sorted in non decreasing order, return an array of the squares of each number, also in sorted non decreasing or 阅读全文
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Description Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which m 阅读全文
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Description Given the root node of a binary search tree (BST) and a value to be inserted into the tree, insert the value into the BST. Return the root 阅读全文
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Description The Fibonacci numbers , commonly denoted form a sequence, called the Fibonacci sequence , such that each number is the sum of the two prec 阅读全文
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Description Given the node of a binary search tree, return the sum of values of all nodes with value between and (inclusive). The binary search tree i 阅读全文
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Description Every email consists of a local name and a domain name, separated by the @ sign. For example, in alice@leetcode.com, alice is the local na 阅读全文
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Description Given an array A of non negative integers, return an array consisting of all the even elements of A, followed by all the odd elements of A 阅读全文
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Description Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the res 阅读全文
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Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function 阅读全文
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Given a non empty array of digits representing a non negative integer, plus one to the integer. The digits are stored such that the most significant d 阅读全文
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Given an array nums and a value val, remove all instances of that value in place and return the new length. Do not allocate extra space for another ar 阅读全文
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Given a 32 bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: Note: Assume we are dealing with an environment which co 阅读全文