Day 5 done. Now this one was the easiest one so far. I was shocked at how simple part 2 was. Just combining all overlapping ranges and doing some simple arithmetic. I initially tried a linear search, and it finished in 1.5ms. Then I switched to a binary search, and now it finishes in 1.7ms. Do not underestimate the power of the processor cache line. If the fresh ranges list were much larger, the binary search would have sped it up, I'm sure.

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