益达的小作坊

关于两个字符串s1,s2的差别，可以通过计算他们的最小编辑距离来决定。 设A、B为两个字符串，狭义的编辑距离定义为把A转换成B需要的最少删除（删除A中一个字符）、插入（在A中插入一个字符）和替换（把A中的某个字符替换成另一个字符）的次数，用ED（A，B）来表示。直观来说，两个串互相转换需要经过的步骤越多，差异越大。对于编辑距离的状态转移较为难想。 正确的思路应当是将s1的前i位数据转换成s2的前

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 [ [2], [3,4], [6,5,

The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid out in a 2D grid. Our valiant knight (K) was initially p