摘要：There are 8 prison cells in a row, and each cell is either occupied or vacant. Each day, whether the cell is occupied or vacant changes according to t 阅读全文

摘要：You are installing a billboard and want it to have the largest height. The billboard will have two steel supports, one on each side. Each steel suppor 阅读全文

摘要：We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, we 阅读全文