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The concept used here is popular by the name "Difference Array"
you can google it by "difference array" or check it out here
https://www.geeksforgeeks.org/difference-array-range-update-query-o1/
btw the approach is really awesome and will make you learn something new and interesting
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Array Manipulation
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The concept used here is popular by the name "Difference Array" you can google it by "difference array" or check it out here https://www.geeksforgeeks.org/difference-array-range-update-query-o1/ btw the approach is really awesome and will make you learn something new and interesting