QuickFind/Union & Weighted quick union
Sep 9, 2015 at 6:50pm UTC
1. Write C++ implementation of quickfind , quickunion and weightedquickunion.
2. Show the contents of the id[] array (based on your solution for problem 1) after each union operation to solve the connectivity problem for the sequence: 0-2 , 1-4, 2-5, 3-6, 0-4, 6-0, and 1-3.
a. For quickfind.
b. For quickunion.
c. For weightedquickunion.
Did i do this right? I dont really understand what #2 is asking me
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public int find(int p) //quick find
{ return id[p]; }
public void union (int p, int q)
{
int pID = find(p);
int qID = find(q);
in the same component.
if (pID == qID) return ;
for (int i = 0; i < id.length; i++)
if (id[i] == pID) id[i] = qID;
count--;
}
private int find(int p) //quick Union
{
while (p != id[p]) p = id[p];
return p;
}
public void union (int p, int q)
{
int pRoot = find(p);
int qRoot = find(q);
if (pRoot == qRoot) return ;
id[pRoot] = qRoot;
count--;
}
public class WeightedQuickUnionUF
{
private int [] id;
private int [] sz;
private int count;
public WeightedQuickUnionUF(int N)
{
count = N;
id = new int [N];
for (int i = 0; i < N; i++) id[i] = i;
sz = new int [N];
for (int i = 0; i < N; i++) sz[i] = 1;
}
public int count()
{ return count; }
public boolean connected(int p, int q)
{ return find(p) == find(q); }
private int find(int p)
{
while (p != id[p]) p = id[p];
return p;
}
public void union (int p, int q)
{
int i = find(p);
int j = find(q);
if (i == j) return ;
if (sz[i] < sz[j]) { id[i] = j; sz[j] += sz[i]; }
else { id[j] = i; sz[i] += sz[j]; }
count--;
}
}
Sep 10, 2015 at 2:33pm UTC
help?
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