Can't identify the problem

#1

#include
using namespace std;
#include <stdio.h>
int main() {
int n;
int arr[n];
cin>>n;
for (int i =0;i<n;i++){
cin>>arr[n];
}
int sum;
cin>>sum;
for(int j=0;j<n;j++){
for(int k=j+1;k<n;k++){
if((arr[j]+arr[k])==sum){
cout<<arr[j]<<" and "<<arr[k];
cout<<endl;
}
}
}
return 0;
}
this is my code not able to understand it is not giving write ans for tests cases

#2

In the question it is mentioned that you have to print the pairs in sorted order. So try with the 2 pointer approach after sorting the array. There must be a hint video on this question. Please refer that.

#3

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