ProductExceptSelfByDivision.java

class Solution {
    public int[] productExceptSelf(int[] nums) {
        int n = nums.length;
        int[] ans = new int[n];
        int prod = 1;
        for(int i = 0; i< n;i++) {
            prod*=nums[i]; // product of all numbers in an array
        }
        for(int i = 0; i< n; i++) {
            ans[i] = prod/nums[i];
        }
        return ans;
    }
}