题解 | 多组_二维数组_T组形式

cnt = int(input())
for _ in range(cnt):
    n, m = map(int, input().split())
    matrix = []
    ans = 0
    for _ in range(n):
        numbers = list(map(int, input().split()))
        matrix.append(numbers)
    for i in range(n):
        for j in range(m):
            ans += matrix[i][j]
    print(ans)