James Pan

原题网址：https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/ Given a string, find the length of the longest substring T that contains at most k distinct characters.

原题网址：https://leetcode.com/problems/paint-house/ There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a cer