题解 | 多组_二维数组_T组形式

import sys

t = int(sys.stdin.readline())

for _ in range(t):
    n, m = map(int, sys.stdin.readline().split())
    total = 0
    for _ in range(n):
        nums = list(map(int, sys.stdin.readline().split()))
        row = nums[:m]
        total += sum(row)
    print(total)