USACO 2021 December Contest, Gold Problem 1. Paired Up
USACO 2021 December Contest, Gold Problem 1. Paired Up There are a total of?NN?(1≤N≤1051≤N≤105) cows on the number line. The location of the?ii-th cow is given by?xixi?(0≤xi≤1090≤xi≤109), and the w...