Re: [algogeeks] Re: Endian-ness check
@Lego: I am sorry I missed the address of operator... I wanted to type: printf(%d, *(char *) (0x0002)) But even the above is incorrect since it is not possible to take address of a literal in C/C++. The best way is: const int i=0x0002; printf(%d, *(char *) (i)); If this print 2, then its little-endian else big-endian (there exists mixed-endianness also, but lets leave that for now.) --Sundeep. On Tue, Jun 15, 2010 at 9:05 PM, Lego Haryanto legoharya...@gmail.comwrote: On Mon, Jun 14, 2010 at 5:13 AM, Sundeep Singh singh.sund...@gmail.comwrote: @saurav: your code will always print 2 irrespective of the system's endianness! correct thing to do is: printf(%d, *(char *) (0x0002)) --Sundeep. ... dereferencing a very low address pointer, are you sure? -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] unique number in an array
use a hash map
On Mon, Jun 14, 2010 at 12:14 AM, jalaj jaiswal
jalaj.jaiswa...@gmail.comwrote:
give an algo to find a unique number in an array
for eg a[]={1,3,4,1,4,5,6,1,5}
here 3 is the unique number as it occur only once... moreover array
contains only 1 unique number
--
With Regards,
Jalaj Jaiswal
+919026283397
B.TECH IT
IIIT ALLAHABAD
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Re: [algogeeks] Re: Endian-ness check
@saurav: your code will always print 2 irrespective of the system's endianness! correct thing to do is: printf(%d, *(char *) (0x0002)) --Sundeep. On Mon, Jun 14, 2010 at 3:02 AM, Minotauraus anike...@gmail.com wrote: How about a pointer? :D On Jun 13, 5:56 am, debajyotisarma sarma.debajy...@gmail.com wrote: Is it possible to check endianness of a system in C without creating variable? i.e. Program should not contain any variable. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Re: binary nos
@rohit: fibonacci sequence may be the answer to the prob, but I am curious why? I haven't come across any such fib sequence property... On Wed, Jun 9, 2010 at 9:16 PM, Rohit Saraf rohit.kumar.sa...@gmail.comwrote: @junta : are fibonacci sequence is the answer of the prob, it is not used :D -- Rohit Saraf Second Year Undergraduate, Dept. of Computer Science and Engineering IIT Bombay http://www.cse.iitb.ac.in/~rohitfeb14http://www.cse.iitb.ac.in/%7Erohitfeb14 On Wed, Jun 9, 2010 at 9:13 PM, Rohit Saraf rohit.kumar.sa...@gmail.comwrote: @debajyoti: read the prob before posting -- Rohit Saraf Second Year Undergraduate, Dept. of Computer Science and Engineering IIT Bombay http://www.cse.iitb.ac.in/~rohitfeb14http://www.cse.iitb.ac.in/%7Erohitfeb14 On Wed, Jun 9, 2010 at 2:37 PM, Debajyoti Sarma sarma.debajy...@gmail.com wrote: First 20 fibo no as follows with binary form 0 = 0 1 = 1 1 = 1 2 = 10 3 = 11 5 = 101 8 = 1000 13 = 1101 21 = 10101 34 = 100010 55 = 110111 89 = 1011001 144 = 1001 233 = 11101001 377 = 10001 610 = 1001100010 987 = 011011 1597 = 1100001 2584 = 10111000 4181 = 101010101 Now please explain how fibo no is coming under consideration.Both kind of no is mixed here. On Wed, Jun 9, 2010 at 8:02 AM, Rohit Saraf rohit.kumar.sa...@gmail.com wrote: Fib comes because she wants the number of such sequences -- -- Rohit Saraf Second Year Undergraduate, Dept. of Computer Science and Engineering IIT Bombay http://www.cse.iitb.ac.in/~rohitfeb14http://www.cse.iitb.ac.in/%7Erohitfeb14 -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Re: binary nos
Whats the logic behind using Fibonacci in determining the number of such sequences? -Sundeep. On Wed, Jun 9, 2010 at 8:02 AM, Rohit Saraf rohit.kumar.sa...@gmail.comwrote: Fib comes because she wants the number of such sequences -- -- Rohit Saraf Second Year Undergraduate, Dept. of Computer Science and Engineering IIT Bombay http://www.cse.iitb.ac.in/~rohitfeb14http://www.cse.iitb.ac.in/%7Erohitfeb14 -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Re: divisible by 3
@Anand and @Minotaurus The code seems to fail for 15. Am I missing something? On Mon, Jun 7, 2010 at 2:20 AM, Minotauraus anike...@gmail.com wrote: @Anand: Thanks for the code. I knew you could do it by bit shifting. :-) On Jun 5, 10:21 pm, Anand anandut2...@gmail.com wrote: Here is a code for it.http://codepad.org/umkh3pjf On Sat, Jun 5, 2010 at 7:14 PM, Minotauraus anike...@gmail.com wrote: Subtract 3 from the number until either you get 0 or a negative number. If you get 0, its divisible, else not. You can probably do this by bit shifting too. On Jun 5, 11:45 am, divya sweetdivya@gmail.com wrote: Find if a number is divisible my 3, without using %,/ or *. You can use atoi(). -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com algogeeks%2bunsubscr...@googlegroups .com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Puzzle
place the L block diagonally... --Sundeep. On Sun, Jun 6, 2010 at 7:29 PM, sharad sharad20073...@gmail.com wrote: A square Island surrounded by bigger square, and in between there is infinite depth water. The distance between them is L. The wooden blocks of L are given. The L length block can't be placed in between to cross it, as it will fall in water (just fitting). How would you cross using these L length blocks. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Check if 2 linked lists are identical
merge sort both lists: O(nlogn) Now, for both lists to be identical, just compare the corresponding elements in the lists i.e. L1(1) == L2(1), L1(2) == L2(2) ... = O(n) --Sundeep. On Wed, Jun 2, 2010 at 10:47 PM, Raj N rajn...@gmail.com wrote: @Antony: The 2 lists should have the same elements as well the number must be equal On Wed, Jun 2, 2010 at 5:38 PM, Antony Vincent Pandian.S. sant...@gmail.com wrote: @Raj What do you mean by identical? You are just concerned about the presence of one element in another LL or you are concerned about the equality of number of elements too? On 6/2/10, Raj N rajn...@gmail.com wrote: @sharad kumar: But don't you think this'll consume a lot of space. Merge sort will give O(nlogn) complexity when a separate LL is used to store the sorted elements but if we disbuild the same LL it'll be O(n2). And also wat do u mean by combining LL can u explain On Wed, Jun 2, 2010 at 6:48 AM, sharad kumar aryansmit3...@gmail.com wrote: @Raj:sorting can be done in O(nlogn)..sort both and compare both.or use a hash map to store all elements of one LL and then compare it with otheror combine both the LL perform merge sort and start deleting adjacent elements.if adjacent elements in equal count then LL are equal and at end of process we get an empty list. On Tue, Jun 1, 2010 at 11:55 PM, Raj N rajn...@gmail.com wrote: Hi all, Can someone suggest an efficient algorithm to check if 2 linked lists are identical. If 2 lists have to be sorted then there'll be a lot of space consumption for 2 separate linked lists. Can the whole process be done O(n2) -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com algogeeks%2bunsubscr...@googlegroups.comalgogeeks%252bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- yezhu malai vaasa venkataramana Govinda Govinda -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com algogeeks%2bunsubscr...@googlegroups.comalgogeeks%252bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- Sent from my mobile device Luv, S.Antony Vincent Pandian -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] value of n
oops On Sat, May 1, 2010 at 5:50 PM, Sundeep Singh singh.sund...@gmail.comwrote: Hi Amit, here's the answer: (I am assuming in your equation lg implies log to the base 10) n 8 log(n) = n/8 log(n) = 10 ^(n/8) n The final deduction was incorrect!! for log base 10, the answer is: 2 = n = 6 --Sudneep. = n 8 --Sundeep. On Sat, May 1, 2010 at 10:43 AM, Amit Agarwal lifea...@gmail.com wrote: I could not get you properly. This is an equation comes from the problem statement where I need to find out cut-off value of n between insertion and merge sort. I think equation is part of basic mathematics but I don't remember how do I solve it. -Regards Amit Agarwal Contact: 09765348182 www.amitagrwal.com On Sat, May 1, 2010 at 9:13 AM, abhijith reddy abhijith200...@gmail.comwrote: binary search on n On Fri, Apr 30, 2010 at 10:15 PM, Amit Agarwal lifea...@gmail.comwrote: how do I compute n from this equation. n 8lg(n) -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] value of n
Hi Amit, This particular example was quite simple.. just required using calculator couple of times. We know log 1 =0 and log 10 = 1, so given the above equation, it was clear that the answer had to lie within the range (1,10) and then I used the calculator couple of times to narrow down the range. For a more generic/complicated equation of this nature, u'll need to plot the functions as people have suggested earlier. Regards, Sundeep. On Mon, May 3, 2010 at 4:51 PM, Amit Agarwal lifea...@gmail.com wrote: yeah, you are right. It comes from 2 to 6. But is there any way to solve it on paper? -Regards Amit Agarwal Contact: 09765348182 www.amitagrwal.com On Mon, May 3, 2010 at 3:02 PM, Sundeep Singh singh.sund...@gmail.comwrote: oops On Sat, May 1, 2010 at 5:50 PM, Sundeep Singh singh.sund...@gmail.comwrote: Hi Amit, here's the answer: (I am assuming in your equation lg implies log to the base 10) n 8 log(n) = n/8 log(n) = 10 ^(n/8) n The final deduction was incorrect!! for log base 10, the answer is: 2 = n = 6 --Sudneep. = n 8 --Sundeep. On Sat, May 1, 2010 at 10:43 AM, Amit Agarwal lifea...@gmail.comwrote: I could not get you properly. This is an equation comes from the problem statement where I need to find out cut-off value of n between insertion and merge sort. I think equation is part of basic mathematics but I don't remember how do I solve it. -Regards Amit Agarwal Contact: 09765348182 www.amitagrwal.com On Sat, May 1, 2010 at 9:13 AM, abhijith reddy abhijith200...@gmail.com wrote: binary search on n On Fri, Apr 30, 2010 at 10:15 PM, Amit Agarwal lifea...@gmail.comwrote: how do I compute n from this equation. n 8lg(n) -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Re: Implement a queue using a stack
Thanks Dave, I didn't think about this... definitely better! Sundeep. On Mon, Mar 22, 2010 at 9:08 PM, Dave dave_and_da...@juno.com wrote: Better still. To enqueue: push onto stack A. For dequeuing: If stack B is empty, pop all items from stack A and push onto stack B. Then pop stack B. There is no need to push remaining items back to stack A. As every item passes through the queue, it is pushed onto stack A, then popped from stack A and pushed onto stack B, and finally popped from stack B. The time is roughly twice the time required for a direct implementation of a queue. There is room for a little optimization if both stacks are empty when enquing, as you can push the item directly onto stack B. Furthermore, when popping from stack A and pushing onto stack B, you don't need to push the last item popped, as it is the return value. Dave On Mar 22, 9:29 am, Sundeep Singh singh.sund...@gmail.com wrote: Hey Brian, Better still, for inserting in queue, just keep pushing onto the stack A. You need stack B only for dequeuing: for dequeuing, push all items into stack B, pop as many as you want from stack B and then push back all remaining items in stack A. Regards, Sundeep. On Mon, Mar 22, 2010 at 6:56 PM, Brian brianfo...@gmail.com wrote: How is it possible to implement a queue using a stack only? Interesting, but tricky... You need two stacks as Prakhar stated... In general, if you have Stack A and Stack B, you should keep all the items in stack A and then use stack B for processing. For example to insert an item: 1. Pop all the items from A and then push them into B (this should push the items into Stack B in reverse order) 2. Insert the new item into A 3. Pop all the items in B and push them back into A (again this will push them back into Stack B in reverse order) Running time should be O(1)+O(2n), which is O(n) for larger values of n - which is not good... To retrieve an item, pop the first item in stack A Hope this helps - Regards B On 3/22/2010 4:55 AM, Prakhar Jain wrote: By a do u mean a single stack ? Otherwise if you use 2 its v simple Best, Prakhar Jain http://web.iiit.ac.in/~prakharjain/http://web.iiit.ac.in/%7Eprakharjain/ http://web.iiit.ac.in/%7Eprakharjain/ On Mon, Mar 22, 2010 at 12:56 AM, Pushpesh Gupta pushpes...@gmail.com wrote: How is it possible to implement a queue using a stack only? -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com algogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com algogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
Re: [algogeeks] Implement a queue using a stack
Hey Brian, Better still, for inserting in queue, just keep pushing onto the stack A. You need stack B only for dequeuing: for dequeuing, push all items into stack B, pop as many as you want from stack B and then push back all remaining items in stack A. Regards, Sundeep. On Mon, Mar 22, 2010 at 6:56 PM, Brian brianfo...@gmail.com wrote: How is it possible to implement a queue using a stack only? Interesting, but tricky... You need two stacks as Prakhar stated... In general, if you have Stack A and Stack B, you should keep all the items in stack A and then use stack B for processing. For example to insert an item: 1. Pop all the items from A and then push them into B (this should push the items into Stack B in reverse order) 2. Insert the new item into A 3. Pop all the items in B and push them back into A (again this will push them back into Stack B in reverse order) Running time should be O(1)+O(2n), which is O(n) for larger values of n - which is not good... To retrieve an item, pop the first item in stack A Hope this helps - Regards B On 3/22/2010 4:55 AM, Prakhar Jain wrote: By a do u mean a single stack ? Otherwise if you use 2 its v simple Best, Prakhar Jain http://web.iiit.ac.in/~prakharjain/http://web.iiit.ac.in/%7Eprakharjain/ On Mon, Mar 22, 2010 at 12:56 AM, Pushpesh Gupta pushpes...@gmail.comwrote: How is it possible to implement a queue using a stack only? -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.comalgogeeks%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en. -- You received this message because you are subscribed to the Google Groups Algorithm Geeks group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
