Problem
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
Example
Input: a = 1, b = 2
Output: 3
Input: a = -2, b = 3
Output: 1
Code
static int var = [](){
std::ios::sync_with_stdio(false);
cin.tie(NULL);
return 0;
}();
class Solution {
public:
int getSum(int a, int b) {
if(!b)
return a;
int Xor = a ^ b;
int And = (a & b) << 1;
return getSum(Xor,And);
}
};
Result
371. Sum of Two Integers.png
