string duplicate

#include <iostream>
using namespace std;
int main(){
int n;
int c=0;
cout<<"enter a no of elements";
cin>>n;
int a[n];
for(int i=0;i<n;i++){
cin>>a[i];
}
for(int i=0;i<n;i++){
for(int j=i+1;j<n;j++){
if(a[i]==a[j]){

}
else{
  b[c]=a[i]
}

}

}

#include <iostream>
using namespace std;

int main()
{
string s;
string s1="";
char c;
cout << "enter a string\n";
cin>>s;
cout << "enter character to be removed\n";
cin>>c;
//cout<<(int)c;
//cout<<(int)s[0];
//cout<<s;
for (int i=0;i<s.length();i++){
if ((int)s[i]==(int)c){

  }
  else {
      s1=s1+s[i];
      
  }

}
cout<<s1;
return 0;
}