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Why is this code getting runtime error?????
By SystemTesting, history, 9 months ago, In English

I've tried every possible way to figure out the problem. But could not figure it out still why it's getting a runtime error on Test Case 3. Please can someone help me with this?? Here's the code 249223416 and here's the problem 1791F - Range Update Point Query

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9 months ago, # |
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Auto comment: topic has been updated by SystemTesting (previous revision, new revision, compare).

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9 months ago, # |
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You don't need to do allat bro. I haven't done competitive programming in YEARS, but I think literally all you have to do is calculate the digital root for each a_i until you end up with a single digit (and you literally could save this in a N by 4 array or sum), use a difference array to simulate the range queries, and then answer the queries that way (it's O(N) too).

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    9 months ago, # ^ |
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    Oh, I'm stupid this shouldn't work. But shouldn't a Fenwick tree work fine here?

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      9 months ago, # ^ |
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      Yeah a fenwick tree could have worked here, but didn't want to overkill the problem.

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9 months ago, # |
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Because you dereference it (in the end of cycle) after possible erasing (in successful if num < 10)

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