Kill the whitewalkers

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Uncle Benjen has some time left after saving Jon, he encounters many white walkers standing in a row starting in front of him and realises that he can kill two white walkers before dying. Night king is feeling lazy after killing the dragon, so he assigned every white walker a number from 1 to n. He decides to kill the two white walkers which are standing at a distance at least equal to the length

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solution.cppC++17

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