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Peeking IteratorGiven an Iterator class interface with methods:next()andhasNext(), design and implement a PeekingIterator that support thepeek()operat... 阅读全文
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Expression Add OperatorsGiven a string that contains only digits0-9and a target value, return all possibilities to addbinaryoperators (not unary)+,-, ... 阅读全文
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Different Ways to Add ParenthesesGiven a string of numbers and operators, return all possible results from computing all the different possible ways t... 阅读全文
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Move ZeroesGiven an arraynums, write a function to move all0's to the end of it while maintaining the relative order of the non-zero elements.For exam... 阅读全文
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Binary Tree Postorder TraversalGiven a binary tree, return thepostordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \... 阅读全文
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Binary Tree Inorder TraversalGiven a binary tree, return theinordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \ ... 阅读全文
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Binary Tree Preorder TraversalGiven a binary tree, return thepreordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \ ... 阅读全文
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Search for a RangeGiven a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity ... 阅读全文
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First Bad VersionYou are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fa... 阅读全文
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Trapping Rain WaterGivennnon-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to tr... 阅读全文