How should I practice Document Edit Events?

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Document Edit Events

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Problem statement

A document starts as the empty string. Process each event in order and return the final document.

["INSERT", position, text] inserts text before the zero-based position.
["DELETE", position, length] removes length characters beginning at position.

An event whose position or range is invalid for the current document is rejected and leaves the document unchanged.

Function

applyDocumentEdits(events: String[][]) → String

Examples

Example 1

events = [["INSERT","0","hello"],["INSERT","5"," world"],["DELETE","5","1"]]return = "helloworld"

The second event adds a leading space before world, and the delete removes that space.

Example 2

events = [["INSERT","0","abc"],["DELETE","4","1"],["INSERT","1","X"]]return = "aXbc"

The out-of-range delete is rejected; the final insert succeeds.

Constraints

0 <= events.length <= 20000.
Inserted text and the final document together contain at most 200000 ASCII characters.
Numeric fields are nonnegative decimal integers.

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