LeetCode 171. Excel Sheet Column Number
题目Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
12345678A -> 1B -> 2C -> 3...Z ->
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LeetCode 994. Rotting Oranges
题目In a given grid, each cell can have one of three values:
the value 0 representing an empty cell;
the value 1 representing a fresh orange;
the value
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LeetCode 437. Path Sum III
题目You are given a binary tree in which each node contains an integer value.
Find the number of paths that sum to a given value.
The path does not need
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LeetCode 987. Vertical Order Traversal of a Binary Tree
题目Given a binary tree, return the vertical order traversal of its nodes values.
For each node at position (X, Y), its left and right children respecti
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LeetCode 442. Find All Duplicates in an Array
题目Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.
Find all the elements that appear t
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LeetCode 211. Add and Search Word - Data structure design
题目Design a data structure that supports the following two operations:
12void addWord(word)bool search(word)
search(word) can search a literal word or
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LeetCode 342. Power of Four
题目Given an integer (signed 32 bits), write a function to check whether it is a power of 4.
Example 1:
12Input: 16Output: true
Example 2:
12Input: 5Ou
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LeetCode 125. Valid Palindrome
题目Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
Note: For the purpose of this problem,
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LeetCode 705. Design HashSet
题目Design a HashSet without using any built-in hash table libraries.
To be specific, your design should include these functions:
add(value): Insert a
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LeetCode 520. Detect Capital
题目Given a word, you need to judge whether the usage of capitals in it is right or not.
We define the usage of capitals in a word to be right when one
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