Where does my code fail?

#1

#include <bits/stdc++.h>

using namespace std;
int main() {
int n;
cin>>n;
int* ptr=new int[n];
for(int i=0;i<n;i++){
cin>>ptr[i];
}
sort(ptr,ptr+n);
int key;
cin>>key;
for(int i=0;i<n;i++){
for(int j=i;j<n;j++){
if(ptr[i]+ptr[j]==key)
cout<<ptr[i]<<" and "<<ptr[j]<<endl;
}
}
delete [] ptr;
return 0;
}

Please explain me the exception case.

#2

Hello Jaideep,
here is your working code- https://ide.codingblocks.com/s/171585
your code was correct.just a small bug was there. By pair they want both element of pair to be at different idices (i know it was not mentioned clearly) . but you were including cases where same element paired with itself .
example
if array is 1 ,2,3,4
and target is 4 then your code was counting (2+2 self pairing)
I hope you find this helpful
regards
Aman yadav

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#3

Whoa! thanks for the crystal clear explanation:heart_eyes:

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#4

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