Question

What does it do – element at index ‘i’ is the product of all input elements except for the input element at ‘i’.

As an example, if arr = { 1, 2, 3, 4 }, then

output = { 2*3*4, 1*3*4, 1*2*4, 1*2*3 }.

#include<cstdio>
#include<iostream>
using namespace std;
int main(){
    int n;
    long long int arr[1000]={0},prod=1;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>arr[i];
        prod*=arr[i];
    }
    if(prod!=0)
        for(int i=0;i<n;i++){
            cout<<(prod/arr[i])<<endl;
        }
    else
        for(int i=0;i<n;i++){
            cout<<"0"<<endl;
        }
    return 0;
}

Answer 1

The simplest case for which it fails is 2 0 1. The correct result would be 1 0, your result is 0 0.

More generally, it fails if there is exactly one zero and at least one non-zero in the input set.