Hi i need help in c++ vectors ... if you have a vector lets say 1,4,5,6,4,6,7 and you have to remove the duplicate vectors i.e to bring it in the form

1,4,5,6,7

....

i tried the double nested loop and trying to get the first vector and comparing with the other vector loops and then if it matches it deletes the vector entery... ( dun knw if its the rite way to do or not )

void alternating_sum(vector<double>& a)  {
        double even=0;
        double odd=0;
        double sum=0;
        for (int i=0;i<a.size()/2;i++){
              v1=a[i];


                    for (int j=0; j<a.size()/2;i++){
                    v2=a[j];
                   if (v1==v2){  
                    double last_pos= a.size()-1;                          a[j]=a[last_pos];
                          a.pop_back();}

could someone help me .. i am just stuck on the part how could i match the first i entery with the other j entery and then delete if its the same or move on ... i tried the above code but gives out error some help would be nice

and could someone let me knw if i am doing it rite or not

ok this is where i have reached but does not work i.e does not give the correct output .. can someone help me asap need this for school

#include <iostream>
#include <vector>

using namespace std;

void alternating_sum(vector<double>& a)
{
    double even=0;
    double sum=0;

        for (int i=0;i<a.size();i++){
        even=a[i];
    
            for (int j=(i+1); j<a.size();i++){
            sum=a[j];
            if (a[i]==a[j]){
                int last= a.size()-1;
                a[j]=a[last];
                a.pop_back();}
                         else 
                cout<<a[i]<<" ";
                    }
            
}
}

int main()
{
   vector<double> a(10);
  
   a[0] = 1;
   a[1] = 4;
   a[2] = 9;
   a[3] = 16;
   a[4] = 9;
   a[5] = 7;
   a[6] = 4;
   a[7] = 9;
   a[8] = 11;

  


alternating_sum(a);
  

   return 0;
}

Try using the erase method of vectors instead of popping them. Read this.

aint there any other way to do without erasing the values ???

aint there any other way to do without erasing the values ???

yes

how would u do it other than erasing it .... help would be nice

But the question here is, why not just erase it ? Is it a requirement ? BTW, you can get all the reference to vector methods here.

Would it be easier to remove duplicates if the vector was sorted first?

Would it be easier to remove duplicates if the vector was sorted first?

Definately. It would then require only a single loop to do away with the duplicates.