Add Two Integers

EASY

Description

Given two integers num1 and num2, return the sum of the two integers.

Example 1:

Input: num1 = 12, num2 = 5
Output: 17
Explanation: num1 is 12, num2 is 5, and their sum is 12 + 5 = 17, so 17 is returned.

Example 2:

Input: num1 = -10, num2 = 4
Output: -6
Explanation: num1 + num2 = -6, so -6 is returned.

Constraints:

-100 <= num1, num2 <= 100

Approaches

Checkout 3 different approaches to solve Add Two Integers. Click on different approaches to view the approach and algorithm in detail.

Direct Addition using `+` Operator

The most efficient, simple, and idiomatic approach is to use the language's built-in addition operator (+). This is the intended solution for a real-world scenario.

Algorithm

Add num1 and num2 using the + operator.
Return the result.

This solution leverages the computer's hardware for maximum performance. Processors have a specialized component, the Arithmetic Logic Unit (ALU), which is designed to perform arithmetic operations like addition extremely quickly, often in a single clock cycle. The + operator in Java (and most other languages) compiles down to a single machine instruction that utilizes the ALU. Therefore, return num1 + num2; is the most optimal way to compute the sum.

class Solution {
    public int sum(int num1, int num2) {
        return num1 + num2;
    }
}

Complexity Analysis

Time Complexity: O(1). The addition is a single, highly optimized hardware instruction.Space Complexity: O(1). No additional space is used beyond what's needed to store the inputs and the return value.

Pros and Cons

Pros:

Maximum efficiency and performance.
Extremely simple, readable, and maintainable code.
This is the standard, idiomatic way to perform addition.

Cons:

If the problem is posed in an interview to test knowledge of bit manipulation, this solution would miss the point.

Code Solutions

Checking out 3 solutions in different languages for Add Two Integers. Click on different languages to view the code.

class Solution {
public
  int sum(int num1, int num2) { return num1 + num2; }
}

Video Solution

Watch the video walkthrough for Add Two Integers

Patterns:

Math

Companies:

Atlassian |Jane Street |