371. Sum of Two Integers也許是最簡潔易懂的做法了
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
Example:
Given a = 1 and b = 2, return 3.
實現：
class Solution {
public:
int getSum(int a, int b) {
while (b){
int x = a ^ b, y = (a & b) << 1;
a = x; b = y;
}
return a;
}
};
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