large sum
I do not have my original code for this problem, but probably I used my bigInteger class. After reviewing this problem, I realized that it is not necessary to use such kind of tools, long long is sufficient.
"
Well, unless the test case is a corner case with flood of "9s. This is something that projectEuler did poorly in early problems. Later on, the problem is always a sum of different cases which is harder to pass for buggy code.
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