diagonal sum, C (gcc)

diagonal sum

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Compilation time: 0.26 sec, absolute running time: 0.4 sec, cpu time: 0.31 sec, memory peak: 3 Mb, absolute service time: 0,67 sec

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matrix one:
10 20 30 40 50 
11 21 31 41 51 
12 22 32 42 52 
13 23 33 43 53 
14 24 34 44 54 
matrix two:
10 20 30 40 50 
11 21 31 41 51 
12 22 32 42 52 
13 23 33 43 53 
14 24 34 44 54 
matrix diagonal sum:
20             
   42          
      64       
         86    
            108