BlogHide Resteemsnbfuhao (44)in programming • 8 years ago[LeetCode] Objective C — Reverse a NSString[LeetCode: reverse a string] ( NSString* reverseString(NSString *originalString)nbfuhao (44)in programming • 8 years ago[LeetCode] Objective C — Check If a String Has Duplicate CharactersBOOL checkDuplicates(NSString *str)nbfuhao (44)in programming • 8 years ago[LeetCode] Convert Sorted Array to Binary Search Tree in Objective CLeetCode Convert Sorted Array to Binary Search Tree in Objective C typedef struct {nbfuhao (44)in programming • 8 years ago[LeetCode] Validate Binary Search Tree in Objective CLeetCode: Validate Binary Search Tree in Objective C nbfuhao (44)in programming • 8 years ago[LeetCode] Balanced Binary Tree in Objective CLeetCode: Balanced Binary Tree in Objective C typedef struct {nbfuhao (44)in programming • 8 years ago[LeetCode] Maximum Depth of Binary Tree in Objective CLeetCode: Maximum Depth of Binary Tree in Objective C typedef struct {nbfuhao (44)in leetcode • 8 years ago[LeetCode] Binary Tree Level Order Traversal in Objective Ctypedef struct {nbfuhao (44)in objective • 8 years ago[LeetCode] Binary Tree Preorder Traversal in Objective C// typedef struct { // int value; // struct TreeNode *left; // struct TreeNode *right; // } TreeNode; -(NSMutableArray *)preorderTraversal:(TreeNode *)treeNode { NSMutableArray…