摘要： Description Before bridges were common, ferries were used to transport cars across rivers. River ferries, unlike their larger cousins, run on a guide 阅读全文

摘要： Description Input is the matrix A of N by N non-negative integers. A distance between two elements Aij and Apq is defined as |i − p| + |j − q|. Your p 阅读全文

摘要： Description Given three strings, you are to determine whether the third string can be formed by combining the characters in the first two strings. The 阅读全文