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The required condition check is the FOR condition; the algorithm checks the index of the current iteration in the FOR loop and performs an appropriate action (skip data, use in calculation, increment counter, end loop execution).
condition checking for FOR loop conditions is trivial because of compilers optimizations. OP has additional condition checking that is not optimal. And you clearly implied that it was necessary.
Performing constant time operations n2 times (the number of iterations of the loop) is, by definition, not trivial when discussing running time. The act of saving data to an array could be considered trivial, because it's an additional O(1) time operation within the loop.
Diagonal Difference
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The required condition check is the FOR condition; the algorithm checks the index of the current iteration in the FOR loop and performs an appropriate action (skip data, use in calculation, increment counter, end loop execution).
condition checking for FOR loop conditions is trivial because of compilers optimizations. OP has additional condition checking that is not optimal. And you clearly implied that it was necessary.
Performing constant time operations n2 times (the number of iterations of the loop) is, by definition, not trivial when discussing running time. The act of saving data to an array could be considered trivial, because it's an additional O(1) time operation within the loop.