1379: C二级辅导-对角线和
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:17
Solved:13
Description
求一个3×3矩阵对角线元素之和。
Sample Input Copy
1 2 3
4 5 6
7 8 9
Sample Output Copy
15