Leetcode Problem 2659. Make Array Empty

2659. Make Array Empty

Leetcode Solutions

Subtract overcount when 'wrapping around'.

  1. Create a list of tuples where each tuple contains an index and its corresponding value from the nums array.
  2. Sort the list of tuples based on the values.
  3. Initialize variables to keep track of the total number of operations (s), the current index (curr), the number of operations to subtract in the current loop (curr_loop_subtract), and the total number of operations to subtract due to 'wrap around' (looped_subtract).
  4. Iterate through the sorted indices.
  5. If the current index is greater than or equal to curr, add the difference between the indices plus one to s, update curr, and increment curr_loop_subtract.
  6. If the current index is less than curr, calculate the 'wrap around' operations, update s by subtracting looped_subtract, update looped_subtract and curr_loop_subtract, and set curr to the current index plus one.
  7. After the loop, subtract the number of operations that have been overcounted from s.
  8. Return the total number of operations s.
UML Thumbnail

Using Segment Tree to Count Operations

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