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Leetcode 2235. Add Two Integers

Problem Statement

The task is to write a function that takes two integers as input and returns their sum.

Example:

Input:

a = 3, b = 2

Output:

5

Clarifying Questions

  1. Input Range: What is the range of the input integers? (Assuming 32-bit signed integers for typical use cases)
  2. Output Type: Should the function always return an integer? (Assuming yes, based on the problem statement)
  3. Edge Cases: Consider edge cases like negative numbers and large integers.

Strategy

This problem is straightforward. Given two integers, we simply return their sum.

  1. Function Definition: Define a function that takes two parameters.
  2. Sum Calculation: Use the + operator to compute the sum of the two integers.
  3. Return Result: Return the result.

Code

#include <iostream>

class Solution {
public:
    int sum(int a, int b) {
        return a + b;
    }
};

// Main function for testing
int main() {
    Solution solution;
    
    int a = 3, b = 2;
    std::cout << "Sum of " << a << " and " << b << " is " << solution.sum(a, b) << std::endl;
    
    return 0;
}

Time Complexity

The time complexity of this function is (O(1)) because it performs a constant-time operation: the addition of two integers. Both the addition and the return operation take constant time.

Space Complexity

The space complexity is also (O(1)) because no additional space is required besides the variables a and b.

Summary

This problem is very straightforward as the core task is simply to sum two integers. Ensure that you properly handle edge cases such as extreme values within the 32-bit integer range.

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