Leetcode Problem 2780. Minimum Index of a Valid Split

2780. Minimum Index of a Valid Split

Leetcode Solutions

Finding the Minimum Index for a Valid Split with Dominant Element

  1. Initialize a frequency map to count the occurrences of each element in the array.
  2. Identify the dominant element by finding the element with a frequency greater than half the size of the array.
  3. Initialize two variables to keep track of the frequency of the dominant element in the left and right subarrays.
  4. Iterate through the array from left to right, updating the frequency of the dominant element in the left subarray.
  5. At each index, calculate the frequency of the dominant element in the right subarray by subtracting the left frequency from the total frequency of the dominant element.
  6. Check if the current index provides a valid split by ensuring the dominant element is dominant in both subarrays.
  7. If a valid split is found, return the current index. If no valid split is found by the end of the iteration, return -1.
UML Thumbnail

Alternative Approach: Prefix and Suffix Frequency Count

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...