摘要：
Permutation SequenceTotal Accepted:44618Total Submissions:187104Difficulty:MediumThe set[1,2,3,…,n]contains a total ofn! unique permutations.By listin... 阅读全文
摘要：
Perfect SquaresTotal Accepted:18854Total Submissions:63048Difficulty:MediumGiven a positive integern, find the least number of perfect square numbers ... 阅读全文
摘要：
Factorial Trailing ZeroesTotal Accepted:44612Total Submissions:144778Difficulty:EasyGiven an integern, return the number of trailing zeroes inn!.Note:... 阅读全文
摘要：
Excel Sheet Column TitleTotal Accepted:45878Total Submissions:230128Difficulty:EasyGiven a positive integer, return its corresponding column title as ... 阅读全文
摘要：
Excel Sheet Column NumberTotal Accepted:55771Total Submissions:142875Difficulty:EasyRelated to questionExcel Sheet Column TitleGiven a column title as... 阅读全文
摘要：
Palindrome NumberTotal Accepted:95552Total Submissions:318732Difficulty:EasyDetermine whether an integer is a palindrome. Do this without extra space.... 阅读全文
摘要：
Kth Largest Element in an ArrayTotal Accepted:32668Total Submissions:109273Difficulty:MediumFind thekth largest element in an unsorted array. Note tha... 阅读全文
摘要：
Flatten Binary Tree to Linked ListTotal Accepted:68105Total Submissions:228885Difficulty:MediumGiven a binary tree, flatten it to a linked list in-pla... 阅读全文
摘要：
Serialize and Deserialize Binary TreeTotal Accepted:6782Total Submissions:27834Difficulty:MediumSerialization is the process of converting a data stru... 阅读全文
摘要：
Binary Tree Maximum Path SumTotal Accepted:55016Total Submissions:246213Difficulty:HardGiven a binary tree, find the maximum path sum.For this problem... 阅读全文
摘要：
Binary Tree Postorder TraversalTotal Accepted:82814Total Submissions:244246Difficulty:HardGiven a binary tree, return thepostordertraversal of its nod... 阅读全文
摘要：
Convert Sorted Array to Binary Search TreeTotal Accepted:61516Total Submissions:173462Difficulty:MediumGiven an array where elements are sorted in asc... 阅读全文
摘要：
Binary Tree Zigzag Level Order TraversalTotal Accepted:49079Total Submissions:179977Difficulty:MediumGiven a binary tree, return thezigzag level order... 阅读全文