Is Add Two Integers easy or hard?

Add Two Integers is classified as an Easy problem. It checks basic programming ability and understanding of arithmetic operations. The optional bit manipulation approach introduces a slightly deeper concept but still remains straightforward.

Add Two Integers Python/Java solution

In Python or Java, the solution is simply returning the sum of the two parameters. Example: return num1 + num2. The same logic works across C++, JavaScript, C#, and other languages because integer addition is a built-in constant-time operation.

How to solve Add Two Integers in O(n)?

The problem does not require O(n) time because the inputs are two integers rather than arrays or lists. The optimal solution runs in O(1) time by directly computing num1 + num2 or using bit manipulation with XOR and carry operations.

What is the best approach for Add Two Integers?

The best approach is the simple arithmetic method that returns num1 + num2. It runs in O(1) time and O(1) space because the CPU performs integer addition directly. The bit manipulation approach is useful for demonstrating how addition works internally using XOR and carry operations.

Is Add Two Integers asked at Google/Amazon/Meta?

Add Two Integers is typically used as a warm-up question rather than a core interview problem. It appears in coding practice sets to verify environment setup and basic syntax before moving to harder algorithmic questions.

What data structure is used in Add Two Integers?

No data structures are required. The solution operates directly on primitive integer values. The bit manipulation variant uses bitwise operations such as XOR and AND instead of additional structures.

What is the time complexity of Add Two Integers?

The time complexity is O(1). Only a single arithmetic or bitwise operation is performed regardless of the input values. No loops over input size are required, so the runtime remains constant.

Description Solution Video 1:05

2235. Add Two Integers

Easy88.0% acceptance9 companies

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

Asked at 9 companies

Akamai Jane Street

Google Microsoft Meta Amazon Bloomberg Accenture Tiktok

Topics

Math

1:05

Still stuck?Read 3 approaches, or watch a walkthrough.

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1class Solution:
2    def sum(self, num1: int, num2: int) -> int:
3        

Starter codePython 3Spaces: 4

Examples

Case 1Case 2

Input

12
5

Input

-10
4

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