题解 | #多组_二维数组_T组形式#
多组_二维数组_T组形式
https://www.nowcoder.com/practice/fe1e902e076b46dd82e7d42e12617893
t=int(input())
for i in range(t):
n,m=map(int,input().split())
s=0
for j in range(n):
a=list(map(int,input().split()))
s+=sum(a)
print(s)
