原题链接
The width of a sequence is the difference between the maximum and minimum elements in the sequence.
Given an array of integers nums, return the sum of the widths of all the non-empty subsequences of nums. Since the answer may be very large, retu…
最小生成树问题
树
连通图 G ( V , E ) G(V,E) G(V,E),若G中不含任何回路,则称G为树。 ∣ V ∣ 1 |V |1 ∣V∣1时称之为平凡树
生成树 G ( V , E ) G(V,E) G(V,E),若G的一个生成子图是一棵树,则称之为G的一棵生成树&#…