标签:tor lan cal str use lang bsp amp code
2017/3/16 20:03:07
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.
思路:
1、^可以得到哪些bit求和后应该是1。(进位的bit应该变成0,1^1=0)
2、&可以得到哪些bit应该进位
3、由于进位后的bit是1可能和第一步得到的1再次产生进位,所以不断循环,直到不产生进位。
版本1
publicclassSolution{
publicint getSum(int a,int b){
while( b !=0){
int y = a ^ b;
int and =(a & b)<<1;
a = y;
b = and;
}
return a;
}
}
标签:tor lan cal str use lang bsp amp code
原文地址:http://www.cnblogs.com/flyfatty/p/6624796.html