+1 rahul and +1 ankuj
On Sat, Sep 3, 2011 at 11:37 AM, icy` <vipe...@gmail.com> wrote:
> Just use a hash to count frequency of something; e.g. in ruby:
> ar= %w(a a b c a b b c d e a d e f)
> freq=Hash.new(0)
> ar.each {|c| freq[c]+=1}
> p freq
>
> #output
> #{"a"=>4, "b"=>3, "c"=>2, "d"=>2, "e"=>2, "f"=>1}
>
> you could only do it in place in O(1) only if your input array is
> already 2*(number of all possible characters) size, but you didnt
> mention size of input array. For example, what if input was just
> [a,b,c,d,e] ? The size is 5. You cant just convert the input
> into [a,1,b,1,c,1,d,1,e,1] without increasing the size to 10. So
> hash is the better method.
>
> On Sep 3, 11:04 am, Ankuj Gupta <ankuj2...@gmail.com> wrote:
> > if for all inputs you array remains of same size we can take it as
> > constant space
> >
> > On Sep 3, 7:49 pm, rajul jain <rajuljain...@gmail.com> wrote:
> >
> >
> >
> >
> >
> >
> >
> > > @ankuj just want to clarify that in hashing method we require array of
> > > fixed size let say arr[26] , so is it considered as constant space or
> not?
> >
> > > On Sat, Sep 3, 2011 at 8:02 PM, siddharam suresh <
> siddharam....@gmail.com>wrote:
> >
> > > > sol already posted please search old thread
> > > > Thank you,
> > > > Sid.
> >
> > > > On Sat, Sep 3, 2011 at 8:01 PM, Ankuj Gupta <ankuj2...@gmail.com>
> wrote:
> >
> > > >> If we take our input to be characters a-z ans A-Z then we require
> > > >> fixed space which can be treated as O(1).
> > > >> On Sep 3, 7:10 pm, teja bala <pawanjalsa.t...@gmail.com> wrote:
> > > >> > this 'll work if u i/p the string in dis manner
> > > >> > aaabbcc(consecutive same)
> > > >> > a3b2c2
> >
> > > >> > #include<stdio.h>
> > > >> > #include<conio.h>
> > > >> > main()
> > > >> > {
> > > >> > int x=1,i=0;
> > > >> > char a[100];
> > > >> > gets(a);
> > > >> > while(a[i]!='\0')
> > > >> > {
> > > >> > while(a[i]==a[i+1])
> > > >> > {
> > > >> > x++;
> > > >> > i++;
> > > >> > }
> > > >> > printf("%c%d",a[i],x);
> > > >> > x=1;
> > > >> > i++;
> > > >> > }
> > > >> > getchar();
> >
> > > >> > }
> >
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