LeetCode 2134: Minimum Swaps to Group All 1's Together II Solution
Master LeetCode problem 2134 (Minimum Swaps to Group All 1's Together II), a medium 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.
2134. Minimum Swaps to Group All 1's Together II
Problem Explanation
Explanation:
To solve this problem, we can use a sliding window approach. First, we calculate the total number of ones in the input array nums. Then we create a window of size equal to the number of ones and move it across the circular array to find the window with the minimum number of zeros. The difference between the total number of ones and the number of ones inside the window gives us the minimum swaps required to group all ones together.
Time Complexity: O(n) Space Complexity: O(1)
:
Solution Code
class Solution {
public int minSwaps(int[] nums) {
int ones = 0;
for (int num : nums) {
if (num == 1) {
ones++;
}
}
int left = 0, right = 0, zeros = 0, maxZeros = 0;
for (; right < nums.length; right++) {
if (nums[right] == 0) {
zeros++;
}
if (right - left >= ones) {
if (nums[left] == 0) {
zeros--;
}
left++;
}
maxZeros = Math.max(maxZeros, zeros);
}
return ones - maxZeros;
}
}Try It Yourself
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