650iq's blog

By 650iq, history, 6 months ago, In English

Hi everyone i was trying this question from Atcoder — https://atcoder.jp/contests/abc157/tasks/abc157_e But im getting runtime error on my code. My approach is to build a segment tree where each node contains a map of characters. And while we go up we keep on merging the maps into a single map and the return the size of the map as a answer to the query. Im not getting any WA but RE. Please help. Here is my submission https://atcoder.jp/contests/abc157/submissions/47573702

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6 months ago, # |
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Auto comment: topic has been updated by 650iq (previous revision, new revision, compare).

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6 months ago, # |
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Hint: look at size of Tree T. is it ok?

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    6 months ago, # ^ |
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    Yeah i guess making vector of map of that size would be getting memory limit exceeded.. any alternate approach or modification in my code can u suggest?

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      6 months ago, # ^ |
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      What if you store the index for all characters in an array? then just a simple check of 26 times if any of them are in this range which can be easily done through binary search.

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        6 months ago, # ^ |
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        Yes i know that approach but i wanted to do this with segment tree