One simple rule can help solve any complex equation. Here's a hint: all it takes is a catchy acronym.

Every so often it's good to exercise your brain with a math problem or two that forces you to recall principles you learned decades prior. As elementary as it might feel, you'd be surprised how easy ...

long[] leftMins = new long[n]; // sum of k smallest from left long[] rightMaxs = new long[n]; // sum of k largest from right long leftSum = 0, rightSum = 0, minDiff = Long.MAX_VALUE; ...