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2235 - Add Two Integers (Easy)

https://leetcode.com/problems/add-two-integers/

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

Approach 1: A + B​

Written by @wingkwong
class Solution {
public:
    int sum(int num1, int num2) {
        return num1 + num2;
    }
};

Approach 2: Half Adder​

Written by @wingkwong
class Solution {
public:
    int sum(int num1, int num2) {
        return num2 == 0 ? num1 : sum(num1 ^ num2, (unsigned) (num1 & num2) << 1);
    }
};

Approach 3: Log & Exp​

Written by @wingkwong
class Solution {
public:
    int sum(int num1, int num2) {
        return log(exp(num1) * exp(num2)));
    }
};