USACO 2019 US Open Contest, Silver Problem 3 Fence Planning
Farmer John's NN cows, conveniently numbered 1…N1…N (2≤N≤1052≤N≤105), have a complex social structure revolving around "moo networks" --- smaller groups of cows that communicate within their group ...
 
       
       
       
       
         
           
           
           
          