LeetCode 3284: Sum of Consecutive Subarrays Solution
Master LeetCode problem 3284 (Sum of Consecutive Subarrays), 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.
3284. Sum of Consecutive Subarrays
Problem Explanation
Explanation:
Given an array of integers nums and an integer k, we need to find the sum of all subarrays of length k in the array.
To achieve this, we can use a sliding window approach. We first calculate the sum of the first k elements and store it. Then, we slide the window by removing the element at the beginning of the window and adding the element at the end of the window. We keep track of the sum of the current window and update the result accordingly. By doing this, we can calculate the sum of all subarrays of length k efficiently.
Solution:
Solution Code
public int[] sumOfConsecutiveSubarrays(int[] nums, int k) {
int n = nums.length;
int[] result = new int[n - k + 1];
int sum = 0;
for (int i = 0; i < k; i++) {
sum += nums[i];
}
result[0] = sum;
for (int i = k; i < n; i++) {
sum += nums[i] - nums[i - k];
result[i - k + 1] = sum;
}
return result;
}Try It Yourself
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