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You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent house...

A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an encoded message containing digits, determine the tota...

[Leetcode 120] Triangle Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ ...

[Leetcode 279] Perfect Squares Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. For example, given n = 12, return 3 because...

[Leetcode 5] Longest Palindromic Substring 1. Description : Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. 2. 题意：找出最长回文子串 思路一:取可能的中...