[algogeeks] thousands of cheating wives profiles

2010-11-21 Thread mohamedkam...@yahoo.com
http://urlder.com/CCb
find cheating wives in your area

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[algogeeks] switch vs if -- which is faster

2010-11-21 Thread shiva
As per my understanding it is compiler depending thing..

what i feel is switch need to evaluate the expression only once but if
else if need to evaluate the expression more than once(what if
expression stored in variable and then compare...)

Does any one please comment difference in speed of switch and if
depending on how it is implemented...

I heard switch uses jump table for its operation.

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[algogeeks] for loop performace in terms of speed makes any difference when we run from max to min and min to max

2010-11-21 Thread shiva
I want to know is there any difference between following two loop in
terms of speed.

1.
for(i=0;imax;i++)
{

//Some operation
}
2.
for(i=max; i; i--)
{

/Some operation

}

I heard second one is faster but don't have any proof

Please comment.

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[algogeeks] Mathematics Puzzle

2010-11-21 Thread vamsee marpu
Does anybody know the solution for the following problem :


*A headmaster of a primary school performs an activity with the students of
a class to encourage them to perform better in academics. He asks them to
stand in queue, starts calling the students out one by one and asks them
their rank in class. Each one has a unique rank in class. If the rank of a
student is better than his/her previous best rank, then he awards him/ her a
lollipop (students love lollipops). Note that the first one in the queue
will always get a lollipop and the students arrange themselves in random
order in the queue. What is the expected number of lollipops the headmaster
will have to distribute among students if the total number of students in
the class is 69? Note that the answer can be a fractional number.*





Thanks and Regards,
M. Vamsee

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[algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread Chi
As he told you it depends on the data runs to the condition. If for
exampe statistically there is more of 1's then 0 then the switch loop
is faster, because:

1.) case is isolated
2.) You can reorder the case-statement according to the occurrent of
the conditions




On Nov 21, 2:59 pm, shiva shivanand.kadwad...@gmail.com wrote:
 how it going to make difference in following case
 --
 i=0;
 switch(i)
 {
 case 1: //some operation
 case 0:// some operation}

 --
 i=0;
 if(i==1)
 {
 //some operation;}

 else if (i==0)
 {
 //Some operation}

 --
 even compiler implement jump table like below

 key address
 1     x
 0     y

 Then two condition (worst case) need to be checked which is same as if
 else if

 Please correct me if i am wrong

 On Nov 21, 6:35 pm, MOHIT  mohit...@gmail.com wrote:

  for switch in the worst case compiler will generate if else chain .. else it
  uses binary decision tree or jump table for optimization at compile time .

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Re: [algogeeks] Re: Swap the LSB and MSB within themself of given no.

2010-11-21 Thread coolfrog$
@gene
plz explain .. what is going on... by taking example. i am unable to run
a test case
1. x=0xAD (1010 1101)
  2.  x1  ===01011010
 |
  x1 01010110
  x  =0100
how we will get
 answer as ( 0101 1011).??

On Sun, Nov 21, 2010 at 9:59 AM, Gene gene.ress...@gmail.com wrote:

 if the input is in unsigned char x, then

 x = ((x  1)  0xAA) | ((x  1)  0x55)
 x = ((x  2)  0xCC) | ((x  2)  0x33)

 On Nov 20, 10:41 pm, Divesh Dixit dixit.coolfrog.div...@gmail.com
 wrote:
  assuming all are 8bit no.
  input = 0x46  (0100   0110)
   output = 0x26 ( 0010  0110 )
  input = 0x75 (0111  0101)
  output = 0xFC (1110  1010 )
 
  Algorithm..???

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Re: [algogeeks] Mathematics Puzzle

2010-11-21 Thread Ashim Kapoor
Do you mean if the rank of a student is better than the rank of the prev
student then he/she gets a lollipop?

Thank you,
Ashim

On Sun, Nov 21, 2010 at 6:57 PM, vamsee marpu marpu.vam...@gmail.comwrote:

 Does anybody know the solution for the following problem :


 *A headmaster of a primary school performs an activity with the students
 of a class to encourage them to perform better in academics. He asks them to
 stand in queue, starts calling the students out one by one and asks them
 their rank in class. Each one has a unique rank in class. If the rank of a
 student is better than his/her previous best rank, then he awards him/ her a
 lollipop (students love lollipops). Note that the first one in the queue
 will always get a lollipop and the students arrange themselves in random
 order in the queue. What is the expected number of lollipops the headmaster
 will have to distribute among students if the total number of students in
 the class is 69? Note that the answer can be a fractional number.*





 Thanks and Regards,
 M. Vamsee

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Re: [algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread MOHIT ....
its depend on compiler how it optimize it . he can make binary search tree
for this comparison
or perform cascading comparison as in if else case .. so worst case
complexity will be as of
if- else .

but for this case

switch(i)

{

case 4: //some operation

case 5:// some operation
case 6 : //
some operation

}
optimization can be done by compiler which need no comparison
just need to calculate index which need to comparison...

so in above case switch is better than if else.

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[algogeeks] Re: Swap the LSB and MSB within themself of given no.

2010-11-21 Thread Dave
@Coolfrog$: Don't forget the bitwise logical products. What is the bit
patterns in those hexadecimal constants? Work out the whole example
and you will see how it works. -- Dave

On Nov 21, 8:21 am, coolfrog$ dixit.coolfrog.div...@gmail.com
wrote:
 @gene
 plz explain .. what is going on... by taking example. i am unable to run
 a test case
 1. x=0xAD (1010 1101)
   2.  x1  ===01011010
          |
       x1 01010110
               x  =    0100
 how we will get
  answer as ( 0101 1011).??





 On Sun, Nov 21, 2010 at 9:59 AM, Gene gene.ress...@gmail.com wrote:
  if the input is in unsigned char x, then

  x = ((x  1)  0xAA) | ((x  1)  0x55)
  x = ((x  2)  0xCC) | ((x  2)  0x33)

  On Nov 20, 10:41 pm, Divesh Dixit dixit.coolfrog.div...@gmail.com
  wrote:
   assuming all are 8bit no.
   input = 0x46  (0100   0110)
    output = 0x26 ( 0010  0110 )
   input = 0x75 (0111  0101)
   output = 0xFC (1110  1010 )

   Algorithm..???

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 (¨`·.·´¨) Always
   `·.¸(¨`·.·´¨ ) Keep
   (¨`·.·´¨)¸.·´Smiling!
    `·.¸.·´ Life can give u 100's of reason 2cry,but u can give life 1000's
 of reasons 2Smile- Hide quoted text -

 - Show quoted text -

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[algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread Chi
@Mohit:

No, it's just the hierarchical occurent of conditions that makes the
switch faster. I really doubt that a compiler build a binary search
tree for switches. Also, it a binary tree works for switches why it
can't optimize the if-else-condition? Did you make some testing?


On Nov 21, 3:28 pm, MOHIT  mohit...@gmail.com wrote:
 its depend on compiler how it optimize it . he can make binary search tree
 for this comparison
 or perform cascading comparison as in if else case .. so worst case
 complexity will be as of
 if- else .

 but for this case

 switch(i)

 {

 case 4: //some operation

 case 5:// some operation
 case 6 : //
 some operation

 }

 optimization can be done by compiler which need no comparison
 just need to calculate index which need to comparison...

 so in above case switch is better than if else.

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[algogeeks] GOOGLE SUMMER OF CODE

2010-11-21 Thread ankit sablok
WHEN IS GOOGLE SUMMER OF CODE 2011 BEGINING AND HOW CAN WE APPLY FOR
IT AND WHAT ARE THE ELIGIBILITY CRITERIA FOR THE APPLICATION.
PLEASE HELP ME OUT WITH THIS APPLICATION PROCEDURE...

THNXX IN ADVANCE

ANKIT SABLOK
B.TECH
COMPUTER SCIENCE AND ENGG

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[algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread Gene
A good compiler will never generate a switch that is slower than an
if...else chain.  They will analyze the switch cases and pick one of
several options for code generation.  These may include cascaded
conditional jumps (like if...else code), simple jump tables, segmented
jump tables (cascaded jumps pick one of several jump tables because a
single table would be too big), binary searches in a sorted table of
case values, and perfect hash functions.  These are the ones I've
seen.  There may be others.


On Nov 21, 8:15 am, shiva shivanand.kadwad...@gmail.com wrote:
 As per my understanding it is compiler depending thing..

 what i feel is switch need to evaluate the expression only once but if
 else if need to evaluate the expression more than once(what if
 expression stored in variable and then compare...)

 Does any one please comment difference in speed of switch and if
 depending on how it is implemented...

 I heard switch uses jump table for its operation.

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Re: [algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread DIPANKAR DUTTA
both are same .. because any good optimizing compiler generate same assembly
code of them...

On Mon, Nov 22, 2010 at 9:38 AM, Gene gene.ress...@gmail.com wrote:

 A good compiler will never generate a switch that is slower than an
 if...else chain.  They will analyze the switch cases and pick one of
 several options for code generation.  These may include cascaded
 conditional jumps (like if...else code), simple jump tables, segmented
 jump tables (cascaded jumps pick one of several jump tables because a
 single table would be too big), binary searches in a sorted table of
 case values, and perfect hash functions.  These are the ones I've
 seen.  There may be others.


 On Nov 21, 8:15 am, shiva shivanand.kadwad...@gmail.com wrote:
  As per my understanding it is compiler depending thing..
 
  what i feel is switch need to evaluate the expression only once but if
  else if need to evaluate the expression more than once(what if
  expression stored in variable and then compare...)
 
  Does any one please comment difference in speed of switch and if
  depending on how it is implemented...
 
  I heard switch uses jump table for its operation.

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-- 
DIPANKAR DUTTA
M-TECH,Computer Science  Engg.
EC Dept,IIT ROORKEE
Uttarakhand , India – 247667
---
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ph no-09045809987
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Re: [algogeeks] Re: Swap the LSB and MSB within themself of given no.

2010-11-21 Thread DIPANKAR DUTTA
x=((x3)(0x11)|(a3) 0x88 |(a1) 0x44 | (a1)  0x22)

On Sun, Nov 21, 2010 at 11:11 PM, Dave dave_and_da...@juno.com wrote:

 @Coolfrog$: Don't forget the bitwise logical products. What is the bit
 patterns in those hexadecimal constants? Work out the whole example
 and you will see how it works. -- Dave

 On Nov 21, 8:21 am, coolfrog$ dixit.coolfrog.div...@gmail.com
 wrote:
  @gene
  plz explain .. what is going on... by taking example. i am unable to
 run
  a test case
  1. x=0xAD (1010 1101)
2.  x1  ===01011010
   |
x1 01010110
x  =0100
  how we will get
   answer as ( 0101 1011).??
 
 
 
 
 
  On Sun, Nov 21, 2010 at 9:59 AM, Gene gene.ress...@gmail.com wrote:
   if the input is in unsigned char x, then
 
   x = ((x  1)  0xAA) | ((x  1)  0x55)
   x = ((x  2)  0xCC) | ((x  2)  0x33)
 
   On Nov 20, 10:41 pm, Divesh Dixit dixit.coolfrog.div...@gmail.com
   wrote:
assuming all are 8bit no.
input = 0x46  (0100   0110)
 output = 0x26 ( 0010  0110 )
input = 0x75 (0111  0101)
output = 0xFC (1110  1010 )
 
Algorithm..???
 
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  (¨`·.·´¨) Always
`·.¸(¨`·.·´¨ ) Keep
(¨`·.·´¨)¸.·´Smiling!
 `·.¸.·´ Life can give u 100's of reason 2cry,but u can give life
 1000's
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M-TECH,Computer Science  Engg.
EC Dept,IIT ROORKEE
Uttarakhand , India – 247667
---
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Re: [algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread LALIT SHARMA
@dipankar

Can u tell us , sumthng more in support of ur ans...??


On Mon, Nov 22, 2010 at 10:40 AM, DIPANKAR DUTTA
dutta.dipanka...@gmail.com wrote:
 both are same .. because any good optimizing compiler generate same assembly
 code of them...

 On Mon, Nov 22, 2010 at 9:38 AM, Gene gene.ress...@gmail.com wrote:

 A good compiler will never generate a switch that is slower than an
 if...else chain.  They will analyze the switch cases and pick one of
 several options for code generation.  These may include cascaded
 conditional jumps (like if...else code), simple jump tables, segmented
 jump tables (cascaded jumps pick one of several jump tables because a
 single table would be too big), binary searches in a sorted table of
 case values, and perfect hash functions.  These are the ones I've
 seen.  There may be others.


 On Nov 21, 8:15 am, shiva shivanand.kadwad...@gmail.com wrote:
  As per my understanding it is compiler depending thing..
 
  what i feel is switch need to evaluate the expression only once but if
  else if need to evaluate the expression more than once(what if
  expression stored in variable and then compare...)
 
  Does any one please comment difference in speed of switch and if
  depending on how it is implemented...
 
  I heard switch uses jump table for its operation.

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 --
 DIPANKAR DUTTA
 M-TECH,Computer Science  Engg.
 EC Dept,IIT ROORKEE
 Uttarakhand , India – 247667
 ---
 website:http://people.iitr.ernet.in/shp/09535009/Website/index.html
 ph no-09045809987
 email:dipan...@iitr.ernet.in

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-- 
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IIIT Allahabad (Amethi Capmus)
5th Sem

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[algogeeks] Re: switch vs if -- which is faster

2010-11-21 Thread Gene
I'm not sure what you mean by support.

If you mean examples, gcc uses several of the techniques I mentioned.
Write some switch statements with different distributions of cases.
Compile with -S, and inspect the assembly code.  If you don't now how
to do that, take the time to learn.

If you mean justify the truth of what I wrote, it's observation while
studying and teaching courses about compilers on and off for over 15
years and building some myself.

BTW, u c I won't ansr mor ??s if wrds arnt spld out...


On Nov 22, 12:28 am, LALIT SHARMA lks.ru...@gmail.com wrote:
 @dipankar

 Can u tell us , sumthng more in support of ur ans...??

 On Mon, Nov 22, 2010 at 10:40 AM, DIPANKAR DUTTA

 dutta.dipanka...@gmail.com wrote:
  both are same .. because any good optimizing compiler generate same assembly
  code of them...

  On Mon, Nov 22, 2010 at 9:38 AM, Gene gene.ress...@gmail.com wrote:

  A good compiler will never generate a switch that is slower than an
  if...else chain.  It will analyze the switch cases and pick one of
  several options for code generation.  These may include cascaded
  conditional jumps (like if...else code), simple jump tables, segmented
  jump tables (cascaded jumps pick one of several jump tables because a
  single table would be too big), binary searches in a sorted table of
  case values, and perfect hash functions.  These are the ones I've
  seen.  There may be others.

  On Nov 21, 8:15 am, shiva shivanand.kadwad...@gmail.com wrote:
   As per my understanding it is compiler depending thing..

   what i feel is switch need to evaluate the expression only once but if
   else if need to evaluate the expression more than once(what if
   expression stored in variable and then compare...)

   Does any one please comment difference in speed of switch and if
   depending on how it is implemented...

   I heard switch uses jump table for its operation.

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  M-TECH,Computer Science  Engg.
  EC Dept,IIT ROORKEE
  Uttarakhand , India – 247667
  ---
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 --
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 IIIT Allahabad (Amethi Capmus)
 5th Sem

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[algogeeks] Re: Mathematics Puzzle

2010-11-21 Thread shiva
If all the person got his rank increased except the first(he is last
know)  then

1. if the previous first ranked person stand front in queue then  69
lollipop need to be distributed.
2. other case 68 lollipop need to be distributed.

On Nov 21, 9:46 pm, Shiv Shankar Prajapati mca.shivshan...@gmail.com
wrote:
 Its total no. of Student i.e. 69.
    If all the students ranking is increased then all the student will get
 the lollipop. But there is one student left who was at top n now on the
 least ranking and as the condition is given that student may appear first
 and get the lollipop. So professor need will give 69 lollipop. in this
 (worst) case.



 On Sun, Nov 21, 2010 at 8:42 PM, Ashim Kapoor ashimkap...@gmail.com wrote:
  Do you mean if the rank of a student is better than the rank of the prev
  student then he/she gets a lollipop?

  Thank you,
  Ashim

  On Sun, Nov 21, 2010 at 6:57 PM, vamsee marpu marpu.vam...@gmail.comwrote:

  Does anybody know the solution for the following problem :

  *A headmaster of a primary school performs an activity with the students
  of a class to encourage them to perform better in academics. He asks them 
  to
  stand in queue, starts calling the students out one by one and asks them
  their rank in class. Each one has a unique rank in class. If the rank of a
  student is better than his/her previous best rank, then he awards him/ her 
  a
  lollipop (students love lollipops). Note that the first one in the queue
  will always get a lollipop and the students arrange themselves in random
  order in the queue. What is the expected number of lollipops the headmaster
  will have to distribute among students if the total number of students in
  the class is 69? Note that the answer can be a fractional number.*

  Thanks and Regards,
  M. Vamsee

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 --
 With Regards,

 Shiv Shankar,

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