#主对角线 i===j ，副对角线 i+j == n-1 (特殊矩阵 ：方阵 n行,m列 n==m) n,num = map(int,input().split()) a = [ list(map(int,input().split())) for x in range(n) ] for i in range(n): for j in range(n): if i==j or i+j == n-1: a[i][j] += num for row in a: for ele in row: print( str(ele).rjust(5),end='' ) # r:right右 justify 对齐 print()