LeetCode 376: Wiggle Subsequence Solution
Master LeetCode problem 376 (Wiggle Subsequence), 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.
376. Wiggle Subsequence
Problem Explanation
Explanation
To find the longest wiggle subsequence, we can use dynamic programming. We can maintain two arrays up and down to store the length of the longest wiggle subsequence ending at the current index where the last element is larger (up) or smaller (down) than the element before it. We then iterate over the input array and update the up and down arrays. The final answer will be the maximum value between the last elements of up and down arrays.
Time complexity: O(n) Space complexity: O(n)
Solution Code
class Solution {
public int wiggleMaxLength(int[] nums) {
if (nums.length < 2) {
return nums.length;
}
int n = nums.length;
int[] up = new int[n];
int[] down = new int[n];
up[0] = down[0] = 1;
for (int i = 1; i < n; i++) {
if (nums[i] > nums[i - 1]) {
up[i] = down[i - 1] + 1;
down[i] = down[i - 1];
} else if (nums[i] < nums[i - 1]) {
down[i] = up[i - 1] + 1;
up[i] = up[i - 1];
} else {
up[i] = up[i - 1];
down[i] = down[i - 1];
}
}
return Math.max(up[n - 1], down[n - 1]);
}
}Try It Yourself
Loading code editor...
Related LeetCode Problems
Frequently Asked Questions
How to solve LeetCode 376 (Wiggle Subsequence)?
This page provides optimized solutions for LeetCode problem 376 (Wiggle Subsequence) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.
What is the time complexity of LeetCode 376 (Wiggle Subsequence)?
The time complexity for LeetCode 376 (Wiggle Subsequence) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.
Can I run code for LeetCode 376 on DevExCode?
Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 376 in Java, C++, or Python.