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can you explain how did you get that formula? I have used this formula but still getting timeout on every testcase except the sample testcase.
You get the formula (or a similar one) if you type into Wolfram Alpha: sum((a+kd)^2,k=0..n)
Project Euler #125: Palindromic sums
You are viewing a single comment's thread. Return to all comments →
can you explain how did you get that formula? I have used this formula but still getting timeout on every testcase except the sample testcase.
You get the formula (or a similar one) if you type into Wolfram Alpha: sum((a+kd)^2,k=0..n)