[LeetCode] Number of Islands
This is a typical problem about searching. In fact, you can use either BFS or DFS for it. Personally, I use BFS because I think it is more intuitive and easy to implement. The idea is fairly simp...
[LeetCode] Letter Combinations of a Phone Number
Well, a typical backtracking problem. Make sure you are clear with the following three problems: What is a partial solution and when is it finished? --- In this problem, the partial solution is a co.....
[LeetCode]65.Valid Number
题目 Validate if a given string is numeric. Some examples: “0” => true ” 0.1 ” => true “abc” => false “1 a” => false “2e10” => true Note: It is intended for the problem statement...
[LeetCode] Largest Number
Well, this problem is designed for radix sort. For more information about radix sort, Introduction to Algorithms, 3rd edition has some nice examples. However, it can be solved simply by using the sor....
[LeetCode] Number of Islands
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assum....
leetcode 202 Happy Number
Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squ...
[LeetCode] Happy Number
Write an algorithm to determine if a number is “happy”. A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares .....
[LeetCode]202.Happy Number
题目 Write an algorithm to determine if a number is “happy”. A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squa...
[LeetCode]191.Number of 1 Bits
题目 Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11’ has binary representation 00000...
[LeetCode]200.Number of Islands
题目 Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may a.....
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