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Multiply Array

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Ever had a list of growth rates or probabilities and needed to find the cumulative product? That’s what Multiply Array is all about! You’re given an array of integers, and your task is to multiply every single number together and return the final mathematical product.

The "secret sauce" here is Cumulative Product. Similar to summing an array, you start with a baseline—but this time it must be 1 (because starting at zero would zero-out your entire total!). As you walk through the list, you multiply your running total by each new number. Think of it like a compound interest calculation: every new number multiplies the size of the total result. It’s a fast, linear O(n) process that’s essential for mathematical modeling and data transformations.

This challenge is a great way to practice loops and basic arithmetic. It’s a fundamental exercise that ensures you understand how to handle iterative calculations properly!

Keep the algorithm focused on one clear invariant and update path so correctness is easy to verify from left to right. This reduces accidental branching errors and helps ensure the final output stays consistent with the problem contract across random and adversarial test shapes.

Examples

Example 1
Input
nums = [1, 2, 3, 4]
Output
24
Explanation

Example 1: Product of [1, 2, 3, 4] is 24

Example 2
Input
nums = [5, 0, 10]
Output
0
Explanation

Example 2: Product is 0 when array contains 0

Example 3
Input
nums = [2, 3]
Output
6
Explanation

Example 3: Product of [2, 3] is 6

Algorithm Flow

Recommendation Algorithm Flow for Multiply Array - Budibadu
Recommendation Algorithm Flow for Multiply Array - Budibadu

Best Answers

java
class Solution {
    public long multiply_array(int[] nums) {
        if (nums == null || nums.length == 0) return 0;
        long product = 1;
        for (int num : nums) product *= num;
        return product;
    }
}