Problem 1158. Sum the elements in either diagonal of a square matrix

What is Size?

Size refers to the number of nodes in a parse tree. Generally speaking, you can think of size as code length.
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Solution 183887 Submitted on 1 Jan 2013 
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Solution 183880 Submitted on 1 Jan 2013 
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Solution 183872 Submitted on 1 Jan 2013 
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Solution 183858 Submitted on 1 Jan 2013 by Richard Zapor 
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23Size
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Solution 183830 Submitted on 1 Jan 2013 by Khaled Hamed 
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Solution 183818 Submitted on 1 Jan 2013 
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Solution 183813 Submitted on 1 Jan 2013 
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Solution 183812 Submitted on 1 Jan 2013 
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Solution 183811 Submitted on 1 Jan 2013 
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22Size
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Solution 183806 Submitted on 31 Dec 2012 by Alfonso Nieto-Castanon 
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Solution 183805 Submitted on 31 Dec 2012 
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25Size
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Solution 183804 Submitted on 31 Dec 2012 by Alfonso Nieto-Castanon 
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36Size
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Solution 183803 Submitted on 31 Dec 2012 by Alfonso Nieto-Castanon 
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Solution 183802 Submitted on 31 Dec 2012 
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37Size
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Solution 183799 Submitted on 31 Dec 2012 by Tom 
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