Programming Interview Questions

8

of 8 votes

34
Answers
Print all valid phone numbers of length n subject to following constraints:

1.If a number contains a 4, it should start with 4
2.No two consecutive digits can be same
3.Three digits (e.g. 7,2,9) will be entirely disallowed, take as input
- cee.el.dg in India | Report Duplicate | Flag | PURGE
Epic Systems Software Engineer / Developer Coding

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Comment hidden because of low score. Click to expand.

-2

of 4 vote

hope this is easier to read and/or correct

Update: Found bug, looking into it

node* reverseByParts(node* head, int parts)
{
	if(head == null || head->next ==null )
	{
		return head;
	}
	else
	{
		node* localHead = head;
		node* globalHead = null;
		node* nodeBeingProcessed = head;
		node* oldSuccessor = null;
		node* oldPredecessor = null;
		int nodesProcessed = 0;
				
		while(nodeBeingProcessed != null)
		{
			while(nodesProcessed < parts && nodeBeingProcessed != null)
			{
				oldSuccessor = nodeBeingProcessed->next;
				nodeBeingProcessed->next = oldPredecessor;
				oldPredecessor = nodeBeingProcessed;
				nodeBeingProcessed = oldSuccessor;
				nodesProcessed++;
			}
			localHead->next = nodeBeingProcessed;
			localHead = nodeBeingProcessed;
			if(nodesProcessed == parts)
			{
				globalHead = oldPredecessor;
			}
			nodesProcessed = 0;
		}
		return newHead;
	}
}

- cee.el.dg January 17, 2013 | Flag Reply

Comment hidden because of low score. Click to expand.

1

of 1 vote

yeah looks good....

I was thinking of something that could construct the number by using a valid digits array rather than iterating through all the pow(n,10) possibilities, atleast 3/10 of which are going to be invalid...

- cee.el.dg January 17, 2013 | Flag Reply

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