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.
有三种方法计算1的个数,可以参看我的其他随笔
1 class Solution { 2 public: 3 int hammingWeight(uint32_t n) { 4 bitset<64> bs(n); 5 return bs.count(); 6 7 } 8 };
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