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题目：Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; }Populate each next poi... 阅读全文
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题目：Given a binary tree, return thepreordertraversal of its nodes' values.For example:Given binary tree{1,#,2,3}, 1 \ 2 / 3return[1,2,3].... 阅读全文
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题目：Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?提示：首先，题目中要求'without using extra space'，... 阅读全文
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题目：Given a positive integer, return its corresponding column title as appear in an Excel sheet.For example: 1 -> A 2 -> B 3 -> C ... 26... 阅读全文
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题目：Related to questionExcel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example: ... 阅读全文