Problem1247--求矩阵对角线元素之和

1247: 求矩阵对角线元素之和

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 5  Solved: 4
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Description

求一个4×4矩阵对角线元素之和。

Input

矩阵

Output

2条对角线元素的和

Sample Input 

1 2 3 4
5 7 0 6
9 1 8 4
7 6 1 3

Sample Output 

19
12

Source/Category

 
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