Problem1369--求以下矩阵主对角线元素之和

1369: 求以下矩阵主对角线元素之和

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 87  Solved: 65
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Description

 求以下矩阵主对角线元素之和

Sample Output 

16

Source/Category

 
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