数组祛除重复

#include<iostream>
#include<algorithm>
#include<numeric>
using namespace std;

void helper(int a[],const int n)
{
  sort(a,a+n);
  int k = 0;
  for(int i = 0;i< n;i++)
  {
   if(a[i] != a[k])
   {
    a[k+1] = a[i];
    k++;
   }
  }
}

int main()
{
    int a[] = {7,8,8,4,5,6,7,8,8,9,1,2,3};
    helper(a,13);
    for(int i = 0;i< 13;i++)
    {
     cout<<a[i]<<" ";
    }
}

这个思路可以借鉴来着