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Sum of Array

Array Easy 15 views
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Ever had a tall stack of receipts and just needed to find the grand total? That’s exactly what Sum of Array is all about! You’re given an array of integers, and your mission is to add every single one of those numbers together and return the final sum.

The "secret sauce" here is Iteration. While most languages have a built-in sum() function that does this in a single line, the core logic is all about walking through the list and keeping a running total. Think of it like a snowball: you start with zero and add each number as you go along. It’s a simple, linear O(n) process that forms the foundation for more complex statistical calculations and data processing.

This is a fundamental skill for any developer. Whether you''re calculating a shopping cart total or a player''s final score, mastering this aggregation logic is a basic building block for your coding journey!

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
10
Explanation

Example 1: Sum of [1, 2, 3, 4] is 10

Example 2
Input
nums = [10, -2, 5]
Output
13
Explanation

Example 2: Sum of [10, -2, 5] is 13

Example 3
Input
nums = [0, 0, 0]
Output
0
Explanation

Example 3: Sum of [0, 0, 0] is 0

Algorithm Flow

Recommendation Algorithm Flow for Sum of Array - Budibadu
Recommendation Algorithm Flow for Sum of Array - Budibadu

Best Answers

java
class Solution {
    public int sum_array(int[] nums) {
        int sum = 0;
        for (int num : nums) sum += num;
        return sum;
    }
}