Add Two Integers - Complete Solution Guide

Add Two Integers is LeetCode problem 2235, a Easy level challenge. This complete guide provides step-by-step explanations, multiple solution approaches, and optimized code in python3, java, cpp, c.

Problem Statement

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

Detailed Explanation

The problem, 'Add Two Integers', asks you to write a function that takes two integer inputs, `num1` and `num2`, and returns their sum as an integer. The problem statement is straightforward; the core task is simply adding two numbers. The constraints specify that both input integers will fall within the range of -100 to 100 inclusive.

Solution Approach

The provided solutions in Python, Java, C++, and C all directly utilize the '+' operator to add the two input integers. This is the most straightforward and efficient way to solve this problem. The function takes two integer arguments, performs the addition, and returns the resulting integer. There's no need for any intermediate steps or complex logic.

Step-by-Step Algorithm

1. Step 1: The function receives two integer inputs, `num1` and `num2`.
2. Step 2: The function performs the addition operation: `num1 + num2`.
3. Step 3: The function returns the result of the addition as an integer.

Key Insights

• Insight 1: This problem is designed to test basic understanding of function definition and return values in the chosen programming language.
• Insight 2: The solution is trivial and directly uses the built-in addition operator of the programming language. No sophisticated algorithms or data structures are required.
• Insight 3: Understanding integer overflow (though not a concern given the constraints) is a related concept that could be explored for similar, but more complex, problems.

Complexity Analysis

Time Complexity: O(1)

Space Complexity: O(1)

Topics

This problem involves: Math.

Companies

Asked at: Atlassian, Jane Street.