对一个给定的n阶正整数矩阵，给定一个正整数k，求出矩阵中所有的最长的直线，并且在此直线上的所有元素之和小于等于k。-For a given positive integer matrix of order n, given a positive integer k, find the matrix of the longest line of all, and all the elements on this line and less than equal to k.