MultiplyAllFieldsExceptOwnPosition.java

package com.interview.array;

/**
 * http://www.careercup.com/question?id=5179916190482432
 * Look out for division by 0
 */
public class MultiplyAllFieldsExceptOwnPosition {

    public int[] multiply(int nums[]) {
        if (nums.length == 0) {
            return new int[0];
        }
        int[] output = new int[nums.length];
        int product = nums[0];
        for (int i = 1; i < nums.length; i++) {
            output[i] = product;
            product *= nums[i];
        }

        output[0] = 1;
        product = nums[nums.length - 1];
        for (int i = nums.length - 2; i >= 0; i--) {
            output[i] *= product;
            product *= nums[i];
        }
        return output;
    }
}