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The string"PAYPALISHIRING"is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font fo... 阅读全文
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Find the total area covered by tworectilinearrectangles in a2Dplane.Each rectangle is defined by its bottom left corner and top right corner as shown ... 阅读全文
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217 - Contains DuplicateGiven an array of integers, find if the array contains any duplicates. Your function should return true if any value appears a... 阅读全文
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Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9 to 4 / \ 7 2 / \ / \9 6 3 1Notice:Google: 90% of our engineers... 阅读全文
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Given two stringssandt, write a function to determine iftis an anagram ofs.For example,s= "anagram",t= "nagaram", return true.s= "rat",t= "car", retur... 阅读全文
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232 - Implement Queue using StacksImplement the following operations of a queue using stacks.push(x) -- Push element x to the back of queue.pop() -- R... 阅读全文