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[每日 LeetCode] 13. Roman to Integer
原文链接 [链接] Description: Roman numerals are represented by seven different symbols: I , V , X , L , C , D and M . Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 100 ..
178
5 年前
[每日 LeetCode] 709. To Lower Case
原文链接 [链接] Description: Implement function ToLowerCase( ) that has a string parameter str, and returns the same string in lowercase. Example 1: Input: 'Hello' Ou ..
132
5 年前
[每日 LeetCode] 929. Unique Email Addresses
原文链接 [链接] Description: Every email consists of a local name and a domain name, separated by the @ sign. For example, in alice@leetcode.com , alice is the local ..
372
5 年前
[每日 LeetCode] 893. Groups of Special-Equivalent Strings
原文链接 [链接] Description: You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of ..
559
5 年前
[每日 LeetCode] 441. Arranging Coins
原文链接 [链接] Description: You have a total of_n_coins that you want to form in a staircase shape, where every k -th row must have exactly k coins. Given n , find t ..
162
5 年前
[每日 LeetCode] 242. Valid Anagram
原文链接 [链接] Description: Given two strings s and t , write a function to determine if t is an anagram of s. Example 1: Input: s = 'anagram', t = 'nagaram' Output: ..
138
5 年前
[每日 LeetCode] 350. Intersection of Two Arrays II
原文链接 [链接] Description: Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Exampl ..
125
5 年前
[每日 LeetCode] 349. Intersection of Two Arrays
原文链接 [链接] Description: Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2] Example ..
162
5 年前
[每日 LeetCode] 543. Diameter of Binary Tree
原文链接 [链接] Description: Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of thelonges ..
165
5 年前
[每日 LeetCode] 559. Maximum Depth of N-ary Tree
原文链接 [每日 LeetCode] 559. Maximum Depth of N-ary Tree Description: Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the ..
168
5 年前
[每日 LeetCode] 101. Symmetric Tree
原文链接 [链接] Description: Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4 ..
135
5 年前
[每日 LeetCode] 108. Convert Sorted Array to Binary Search Tree
原文链接 [链接] Description: Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced bin ..
154
5 年前
[每日 LeetCode] 687. Longest Univalue Path
原文链接 [链接] Description: Given a binary tree, find the length of the longest path where each node in the path has the same value. This path may or may not pass th ..
208
5 年前
[每日 LeetCode] 111. Minimum Depth of Binary Tree
原文链接 [链接] Description: Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to ..
123
5 年前
[每日 LeetCode] 637. Average of Levels in Binary Tree
原文链接 [链接] Description: Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 ..
167
5 年前
[每日 LeetCode] 530. Minimum Absolute Difference in BST
原文链接 [链接] Description: Given a binary search tree with non-negative values, find the minimum [链接] between values of any two nodes. Example: Input: 1 \ 3 / 2 Out ..
134
5 年前
[每日 LeetCode] 110. Balanced Binary Tree
原文链接 [链接] Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as: a binary tree in which the dep ..
123
5 年前
[每日 LeetCode] 257. Binary Tree Paths
原文链接 [链接] Description: Given a binary tree, return all root-to-leaf paths. Note: A leaf is a node with no children. Example: Input: 1 / \ 2 3 \ 5 Output: ['1-&g ..
116
5 年前
[每日 LeetCode] 671. Second Minimum Node In a Binary Tree
原文链接 [链接] Description: Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or ze ..
101
5 年前
[每日 LeetCode] 429. N-ary Tree Level Order Traversal
原文链接 [每日 LeetCode] 429. N-ary Tree Level Order Traversal Description: Given an n-ary tree, return the level order traversal of its nodes' values. (ie, from left ..
132
5 年前
[每日 LeetCode] 107. Binary Tree Level Order Traversal II
原文链接 [链接] Description: Given a binary tree, return the_bottom-up level order_traversal of its nodes' values. (ie, from left to right, level by level from leaf t ..
151
5 年前
[每日 LeetCode] 102. Binary Tree Level Order Traversal
原文链接 [链接] Description: Given a binary tree, return the_level order_traversal of its nodes' values. (ie, from left to right, level by level). For example: Given ..
152
5 年前
[每日 LeetCode] 404. Sum of Left Leaves
原文链接 [链接] Description: Find the sum of all left leaves in a given binary tree. Example: 3 / \ 9 20 / \ 15 7 There are two left leaves in the binary tree, with v ..
125
5 年前
[每日 LeetCode] 112. Path Sum
原文链接 [链接] Description: Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the ..
102
5 年前
[每日 LeetCode] 226. Invert Binary Tree
原文链接 [链接] Description: Invert a binary tree. Example: Input: 4 / \ 2 7 / \ / \ 1 3 6 9 Output: 4 / \ 7 2 / \ / \ 9 6 3 1 Trivia: This problem was inspired by [链 ..
174
5 年前
[每日 LeetCode] 572. Subtree of Another Tree
原文链接 [链接] Description: Given two non-empty binary trees s and t , check whether tree t has exactly the same structure and node values with a subtree of s. A sub ..
326
5 年前
[每日 LeetCode] 100. Same Tree
原文链接 [链接] Description: Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are struc ..
118
5 年前
[每日 LeetCode] 104. Maximum Depth of Binary Tree
原文链接 [链接] Description: Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to t ..
142
5 年前
[每日 LeetCode] 653. Two Sum IV - Input is a BST
原文链接 [链接] Description: Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the gi ..
121
5 年前
[每日 LeetCode] 700. Search in a Binary Search Tree
原文链接 [链接] Description: Given the root node of a binary search tree (BST) and a value. You need to find the node in the BST that the node's value equals the give ..
143
5 年前
[每日 LeetCode] 783. Minimum Distance Between BST Nodes
原文链接 [链接] Description: Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in ..
198
5 年前
[每日 LeetCode] 872. Leaf-Similar Trees
原文链接 [每日 LeetCode] 872. Leaf-Similar Trees Description: Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a le ..
146
5 年前