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Priority Queues

Posted on 2006-11-01
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Last Modified: 2011-09-20
How can  I turn a vector into a min-heap, then into a priority queue, Can I have an example?
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Question by:MissProgrammer
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6 Comments
 
LVL 86

Accepted Solution

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jkr earned 1000 total points
ID: 17851235
What do you mean by a 'min-heap'? In general, you can do that like

vector<int> v;

//... fill vector

priority_queue<int> q(v.begin(),v.end());

See also http://www.sgi.com/tech/stl/priority_queue.html
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Author Comment

by:MissProgrammer
ID: 17852787
Min-heap means that I have to store the vector in a heap that has the lowest number first,  I want to execute the character with the lowest time in my programm
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LVL 86

Expert Comment

by:jkr
ID: 17852915
Then sort (http://www.sgi.com/tech/stl/sort.html) the vector first:

vector<int> v;

//... fill vector

sort(v.begin(),v.size());

priority_queue<int> q(v.begin(),v.end());
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Author Comment

by:MissProgrammer
ID: 17852938
Will it be the lowest value be on top of the priority queue or do I need some type of compare function?
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LVL 86

Expert Comment

by:jkr
ID: 17853105
Yes, see check the 'sort' example on http://www.sgi.com/tech/stl/sort.html

int A[] = {1, 4, 2, 8, 5, 7};
const int N = sizeof(A) / sizeof(int);
sort(A, A + N);
copy(A, A + N, ostream_iterator<int>(cout, " "));
// The output is " 1 2 4 5 7 8".
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Author Comment

by:MissProgrammer
ID: 17853176
Thanks that really helped
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