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Quicksort algorithm
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#Quicksort #algorithm.
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Quicksort algorithm.
quicksort.
Hy vọng những Chia sẻ về chủ đề quicksort này sẽ hữu ích cho bạn. Xin chân thành cảm ơn.
10:12
Agghhh!
You say segment is invalid that's y we don't write if(start == end) but what about https://practice.geeksforgeeks.org/problems/quick-sort/1# where the constraint is 1 <= N <= 10^(3)
Why does writing if(start == end) still give RunTime Error there ?
Hence, Valid Reason :
If
start = 0, end = 1
And partitionIndex is 0
Then, wouldn't one of the quicksort arguments be
q(a, 0, -1)?
This explanation is so clean!! Thoroughly enjoyed watching this 😀
We really miss you sir 😢😔💔 #rip #humblefool
#include<iostream>
using namespace std;
void quick_sort(int *A,int start,int end);
int partition(int *A,int start,int end);
int main()
{
int A[]={3,5,2,1,4,6,9,10};
quick_sort(A,0,8);
for(int i=0;i<8;i++)
cout<<A[i]<<" ";
}
int partition(int *A,int start,int end)
{
int pivot=A[end];
int pIndex=start;
for(int i=0;i<end-1;i++)
{
if(A[i]<=pivot)
swap(A[i],A[pIndex]);
pIndex++;
}
swap(A[pIndex],A[end]);
return pIndex;
}
void quick_sort(int *A,int start,int end)
{
if(start<end)
return;
int pIndex=partition(A,start,end);
quick_sort(A,start,pIndex-1);
quick_sort(A,pIndex+1,end);
}
I am not getting right output can anyone help me out pls?
One issue
at video 17:19, if loops start, i=0, and A[i] is 3 instead of 7, less than pivot value of 4, your logic says swap A[i] with A[pIndex], meaning swap A[0] with A[0], then it essentially doesn't swap anything. Seems this is a bug of this logic.
Hilarious explanation,tq soooo much
damn this is so simple. I always feared quick sort and merge sort like monsters.
I cannot find heap sort in this channel. Can anybody share in the reply, if you know.
I am java Developer but still prefer this code, repeatedly wathching this video before interview
@mycodeschool – have you stopped making videos?
This man passed away but his voice still helps us and he is alive in our hearts.
Why are you not making videos lectures now ?? May I know the reason…
Where can i download source code?
Wow! I couldn't find a single video that explains quicksort better. Thank you so much for such a thorough and easy to understand tutorial!
Whenever I forget QuickSort I come here to revise .
Ho. Currently learning sorting algorithms and tried testing them out on an array of 100,000 integers lol. Im very thankful for the videos you've made ive learned a lot. But as i tested mergesort on the said array, run time was 18 seconds, while quicksort ran forever. im not sure where the problem lies. ive done the randomized partitioning, too, btw. has anyone tried this or am i the only one?
Here is the Java version of Quick Sort with above implementation.. Thanks for clear explanation to MyCodeSchool!!!
public class QuickSort {
public static void main(String args[]) {
int a[] = {7,2,1,6,8,5,3,4};
quickSort(a,0, a.length-1);
for(int element: a) System.out.print(element+" ");
}
private static void quickSort(int[] a, int start, int end) {
if (start < end) {
int partitionIndex = partition(a, start, end);
quickSort(a, start, partitionIndex-1);
quickSort(a, partitionIndex+1, end);
}
}
private static int partition(int[] a, int start, int end) {
int pivot = a[end];
int pIndex = start;
for(int i=start; i<end; i++) {
if(a[i] <= pivot) {
int temp = a[i];
a[i] = a[pIndex];
a[pIndex] = temp;
pIndex++;
}
}
int temp = a[end];
a[end] = a[pIndex];
a[pIndex] = temp;
return pIndex;
}
}
Just one small correction , in the if statement , correct condition should be if (a[i]<pivot) and not (a[i]<=pivot) . However , thanks for the useful videos !!!
I think this is the best algorithmic approach to Quicksort. Also, I would supplement this explanation with this one: https://www.youtube.com/watch?v=kUon6854joI&list=PLsc9bioKSphiPFiecMF5sUyoAz29Og1rT&index=31
There is a bug with the pseudocode, the loop should be until "end" not to "end-1"
the clearest…
Thank you. Very clearly presented the material.
This great man is no more alive………
Explaining the tracing of the algorithm helps sooo much especially with recursion. So helpful!
For algo 7:35
For partision 14:41
at the start you say that all elements greater than the pivot will be to the right, but the code doesn't do that. Rather it arranges things so everything to the left of the pIndex (based on the pivot value) is smaller than the pivot and everything to the right is larger. Is that right?
NVM, your final swap in the partition algorithm took care of that haha.
Finally a good explanation, many thanks!