MAGMA Interview Question for Software Engineer / Developers






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0
of 0 vote

1. Quick sort Avg O(nlogn), best O(n^2)

void swap(int a, int b )
{
	if( a != b )
	{
		a = a ^ b ;
		b = a ^ b ;
		a = a ^ b ;
	}
}

int Partition(int A[], int start, int end)
{
	int pivot ; // pivot element
	int le; // Left end index
	int re; // right end index
	
	pivot = A[start];
	le = start + 1;
	re = end;

	while( le < re )
	{
		while( A[le] < pivot )
			le++;
		while( A[re] < pivot )
			re--;
if( le < re)
		swap( A[le], A[re] );
	}


	swap(A[le], pivot );
	
	return le;
}

void QuickSort(int A[], int start, int end )
{
	if( start >= end )
	{
		return;
	}
	
	int pivotIndex = Partition( A , start, end );
	
	QuickSort( A, start, pivotIndex-1 );
	QuickSort( A, pivotIndex+1, end );  
}

In case if find any bug in my code please let me know ?

- siva.sai.2020 February 17, 2011 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

inside While loop

there should be extra check

if( le < re)
swap( A[le], A[re] );

- siva.sai.2020 April 26, 2015 | Flag Reply


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