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461.hamming-distance.cpp
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56 lines (53 loc) · 1.06 KB
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// Tag: Bit Manipulation
// Time: O(1)
// Space: O(1)
// Ref: -
// Note: -
// The Hamming distance between two integers is the number of positions at which the corresponding bits are different.
// Given two integers x and y, return the Hamming distance between them.
//
// Example 1:
//
// Input: x = 1, y = 4
// Output: 2
// Explanation:
// 1 (0 0 0 1)
// 4 (0 1 0 0)
// ↑ ↑
// The above arrows point to positions where the corresponding bits are different.
//
// Example 2:
//
// Input: x = 3, y = 1
// Output: 1
//
//
// Constraints:
//
// 0 <= x, y <= 231 - 1
//
//
class Solution {
public:
int hammingDistance(int x, int y) {
int n = x ^ y;
int res = 0;
while (n) {
res += 1;
n = n & (n - 1);
}
return res;
}
};
class Solution {
public:
int hammingDistance(int x, int y) {
int diff = x ^ y;
int res = 0;
while (diff) {
res += diff & 1;
diff = diff >> 1;
}
return res;
}
};