Array target sum

#1

what is wrong with my code
#include
#include
using namespace std;
int main() {
int arr[100],n,t,sum;
cin>>n;
for(int i=0;i<n;i++){
cin>>arr[i];
}
cin>>t;
sort(arr,arr+n);

for(int i=0;i<n;i++){
	for(int j=i+1;j<n;j++){
		sum=arr[i]+arr[j];
		if(sum==t){
			cout<<arr[i]<<"and"<<arr[j]<<endl;
		}
	}
}

}

#2

make size of array to 10000
int arr[10000];

it is giving run time error because size of array is less than that mention in question constraints

#3

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