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题目描述:(链接)Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a total of 5 unique B... 阅读全文
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1 -(BOOL)isValidateEmail:(NSString *)email {2 NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; 3 NSPredicate *email... 阅读全文
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[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] 阅读全文
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题目描述:(链接)Given inorder and postorder traversal of a tree, construct the binary tree.解题思路: 1 /** 2 * Definition for a binary tree node. 3 * struct Tr... 阅读全文
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题目描述:(链接)Given preorder and inorder traversal of a tree, construct the binary tree.解题思路： 1 /** 2 * Definition for a binary tree node. 3 * struct Tre... 阅读全文