Number of 1 Bits
Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight).
For example, the 32-bit integer ’11’ has binary representation 00000000000000000000000000001011, so the function should return 3.
思路
程序员入门101
这里用最小时间复杂度的
就是-1和自己&
代码
class Solution {
public:
int hammingWeight(uint32_t n) {
int num=0;
while(n)
{
n = n&(n-1);
num++;
}
return num;
}
};
本文介绍了一种快速计算无符号整数中二进制1位数数量的方法,通过位运算实现最小时间复杂度。
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