2878: 计算矩阵边缘元素之和

解题思路:

注意事项:

参考代码:

a,b = map(int,input().strip().split())

l = []

for i in range(a):

    t = list(map(int,input().strip().split()))

    l.append(t)

s = 0

for i in range(a):

    s += (l[i][0] + l[i][b-1])

for i in range(b):

    s += (l[0][i] + l[a-1][i])

s = s - l[0][0] - l[0][b-1] -l[a-1][0] - l[a-1][b-1]

print(s)