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# 371. Sum of Two Integers

Easy

Calculate the sum of two integers a and b, but you are **not allowed** to use the operator `+` and `-`.

## :innocent: [Solution](https://leetcode.com/problems/sum-of-two-integers/)

{% tabs %}
{% tab title="O(ab)" %}

```python
class Solution:
    def getSum(self, a: int, b: int) -> int:

        MAX = 0x7FFFFFFF
        MIN = 0x80000000
        mask = 0xFFFFFFFF
        
        while b != 0:
            a, b = (a ^ b) & mask, ((a & b) << 1) & mask

        return a if a <= MAX else ~(a ^ mask)
```

{% endtab %}
{% endtabs %}