October Challenge 2020 Division 1

打了两次div2,终于能打div1了,还是挺兴奋的

Positive AND(10.2)
Replace for X(10.3)
Inversions(10.4)
D-Dimensional MST(10.4)
Adding Squares(10.4)
Compress all Subsegments(10.5)
Rooted Minimum Spanning Tree(10.5)
Random Knapsack(10.8)
Village Road Network(未做)

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