题解 | 矩阵计算
矩阵计算
https://www.nowcoder.com/practice/0c83231923c541d2aa15861571831ee5
import re
line = input().split()
n, m = int(line[0]), int(line[1])
list = [] * n
for i in range(n):
list.append(input())
list[i] = [int(x) for x in list[i].split()]
result=0
for list in list:
for num in list:
if num>0:
result+=num
print(result)