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Count Complete Tree NodesGiven acompletebinary tree, count the number of nodes.Definition of a complete binary tree fromWikipedia:In a complete binary... 阅读全文
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Sudoku SolverWrite a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character'.'.You may assume that the... 阅读全文
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Letter Combinations of a Phone NumberGiven a digit string, return all possible letter combinations that the number could represent.A mapping of digit ... 阅读全文
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TriangleGiven a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given... 阅读全文
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Jump Game IIGiven an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents... 阅读全文
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ZigZag ConversionThe string"PAYPALISHIRING"is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern i... 阅读全文
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Longest Consecutive SequenceGiven an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given[100, 4... 阅读全文
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3SumGiven an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero.Note:El... 阅读全文
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Reverse Linked ListReverse a singly linked list.click to show more hints.Hint:A linked list can be reversed either iteratively or recursively. Could y... 阅读全文
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Contains Duplicate IIGiven an array of integers and an integer k, return true if and only if there are two distinct indices i and j in the array such ... 阅读全文