摘要： Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the grid that form an axis 阅读全文

摘要： Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete th 阅读全文

摘要： Once you pay the cost, you can either climb one or two steps. You need to find minimum cost to reach the top of the floor, and you can either start fr 阅读全文