Problem1902--C二级辅导-对角线和

1902: C二级辅导-对角线和

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1  Solved: 1
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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

Source/Category

 
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