LeetCode 3226: Number of Bit Changes to Make Two Integers Equal Solution
Master LeetCode problem 3226 (Number of Bit Changes to Make Two Integers Equal), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
3226. Number of Bit Changes to Make Two Integers Equal
Problem Explanation
Explanation
To solve this problem, we need to compare the binary representations of integers n and k. We iterate through the bits of n and k simultaneously. If a bit in n is 1 and the corresponding bit in k is 0, we need to change that bit. We can count the number of changes needed and return it as the result. If at any point we encounter a situation where n has more 1s than k, it is impossible to make n equal to k and we return -1.
- Time complexity: O(log(max(n, k)))
- Space complexity: O(1)
Solution Code
class Solution {
public int minFlips(int n, int k) {
int count = 0;
while (n > 0 || k > 0) {
if ((n & 1) == 1 && (k & 1) == 0) {
count++;
}
n >>= 1;
k >>= 1;
}
return (n > 0) ? -1 : count;
}
}Try It Yourself
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