My code for problem of sum of all sub matrices

#1

as the sir is explained the lecture to calculate using prefix sum i am try this in my code but not getting answer try to so had but didnt find my mistake kindly a look to my code and correct me where i am wrong

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sir my code i get negative answer
the code u sent in that also ide show negative answer

#2

updated code --> https://ide.codingblocks.com/s/235534

#3

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