bool operator()(point a, point b){
return a.x<b.x;
}
remove references it should work. following is working code.
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
typedef struct
{
int x;
int y;
}point;
struct comp_x
{
bool operator()(point a, point b){
return a.x<b.x;
}
} compx;
struct comp_y
{
bool operator()(point a, point b){
return a.y<b.y;
}
} compy;
int main()
{
vector<point> vc;
int n;
cin>>n;
point a;
for(int i=0;i<n;i++)
{
cin>>a.x;
cin>>a.y;
vc.push_back(a);
}
cout<<endl;
sort(vc.begin(), vc.end(), compx);
cout<<"By X\n";
for(int i=0;i<n;i++)
{
cout<<vc[i].x<<" "<<vc[i].y<<endl;
}
sort(vc.begin(), vc.end(), compy);
cout<<"By Y\n";
for(int i=0;i<n;i++)
{
cout<<vc[i].x<<" "<<vc[i].y<<endl;
}
return 0;
}
On Wed, Aug 10, 2011 at 6:31 PM, aanchal goyal <goyal.aanch...@gmail.com>wrote:
> sorry, comp is either comp_x or comp_y
>
>
> On Wed, Aug 10, 2011 at 6:24 PM, Nitin Nizhawan
> <nitin.nizha...@gmail.com>wrote:
>
>> what is "comp" in your code?
>>
>>
>> On Wed, Aug 10, 2011 at 6:19 PM, aanchal goyal
>> <goyal.aanch...@gmail.com>wrote:
>>
>>> I have a vector of stuct, how to sort this vector?
>>> problem is I can't overload the '<' operator in struct definition, as i
>>> want to sort by 'x' one time, and then by 'y'. I tried to write the
>>> comparator function separatley but its no working. How to do it?
>>>
>>> #include<iostream>
>>> #include<algorithm>
>>> #include<vector>
>>>
>>> using namespace std;
>>>
>>>
>>> typedef struct
>>> {
>>> int x;
>>> int y;
>>> }point;
>>>
>>> struct comp_x
>>> {
>>> bool operator()(point &a, point &b)
>>> return a.x<b.x;
>>> }
>>>
>>> struct comp_y
>>> {
>>> bool operator()(point &a, point &b)
>>> return a.y<b.y;
>>> }
>>>
>>> int main()
>>> {
>>> vector<point> vc;
>>> int n;
>>> cin>>n;
>>> point a;
>>>
>>> for(int i=0;i<n;i++)
>>> {
>>> cin>>a.x;
>>> cin>>a.y;
>>> vc.push_back(a);
>>> }
>>> cout<<endl;
>>> sort(vc.begin(), vc.end(), comp);
>>>
>>> for(int i=0;i<n;i++)
>>> {
>>> cout<<vc[i].x<<" "<<vc[i].y<<endl;
>>> }
>>>
>>> system("pause");
>>> return 0;
>>> }
>>>
>>>
>>> --
>>> Regards,*
>>> Aanchal Goyal*.
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "Algorithm Geeks" group.
>>> To post to this group, send email to algogeeks@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 algogeeks@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.
>>
>
>
>
> --
> Regards,*
> Aanchal Goyal*.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Algorithm Geeks" group.
> To post to this group, send email to algogeeks@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 algogeeks@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.
