C語言代寫 | CSc 345: Homework Assignment 4

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C語言代寫 | CSc 345: Homework Assignment 4

  1. (10pts) Give a θ(n)-time nonrecursive procedure that reverses a singly
    linked list of n elements. The procedure should use no more than constant
    storage beyond that needed for the list itself.
  2. (10pts) Suppose that we are storing a set of n keys into a hash table of
    size m. Show that if the keys are drawn from a universe U with |U| > nm,
    then U has a subset of size n consisting of keys that all hash to the same
    slot, so that the worst-case searching time for hashing with chaining is
    θ(n).
  3. (10pts) What is the difference between the binary-search-tree property
    and the min-heap property (see page 153)? Can the min-heap property
    be used to print out the keys of an n-node tree in sorted order in O(n)
    time? Show how, or explain why not.
  4. (10pts) Write the TREE-PREDECESSOR procedure.
  5. (10pts) Consider a binary search tree T whose keys are distinct. Show
    that if the right subtree of a node x in T is empty and x has a successor
    y, then y is the lowest ancestor of x whose left child is also an ancestor of
    x. (Recall that every node is its own ancestor.)
  6. (10pts) An alternative method of performing an inorder tree walk of an
    n-node binary search tree finds the minimum element in the tree by calling
    TREE-MINIMUM and then making n ? 1 calls to TREE-SUCCESSOR.
    Prove that this algorithm runs in θ(n) time.
  7. (10pts) We can sort a given set of n numbers by first building a binary
    search tree containing these numbers (using TREE-INSERT repeatedly
    to insert the numbers one by one) and then printing the numbers by an
    inorder tree walk. What are the worst-case and best-case running times
    for this sorting algorithm?
    1
  8. (10pts) Given an adjacency-list representation of a directed graph, how
    long does it take to compute the out-degree of every vertex? How long
    does it take to compute the in-degrees?
  9. (10pts) Let (u, v) be a minimum-weight edge in a connected graph G.
    Show that (u, v) belongs to some minimum spanning tree of G.
  10. (10pts) Prove that if G is an undirected bipartite graph with an odd
    number of vertices, then G is nonhamiltonian.

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