Hallelujah520的博客

Masha and Grisha like studying sets of positive integers.One day Grisha has written a set A containing n different integers ai on a blackboard. Now he asks Masha to create a set B containing n differen

You are given an matrix M (consisting of nonnegative integers) and an integer K. For any submatrix of M’ of M define min(M’) to be the minimum value of all the entries of M’. Now your task is simple: