MarioYC's blog

BIT solution for Codeforces #91 E
By MarioYC, 11 years ago, In English
I was looking at solution 810236 from hpfdf and also other users, who only for every query "add l r d" do a for loop from l to r and make at most two update operations in a BIT.

Why does this work? I think something like this would do more than 109 operations.
 
 
 
 
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11 years ago, # |
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I think the data is rondom,so the length of each query range is not large.I also used a BIT to solve this problem although it is not the best solution.
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4 years ago, # |
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what exactly is almost lucky number? sorry if it is stupid but sb pls answer

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    3 years ago, # ^ |
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    It is a condition given in the problem statements of codeforces beta round 91. If you read any problem statement from this round I hope you will understand.

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4 years ago, # |
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I think that because of this condition:

The operations are such that after all additions the array won't have numbers that would exceed 104

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18 months ago, # |
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Can you please provide testcase 26 of A problem

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18 months ago, # |
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I think if code give "YES" for 141(input) then it will also work fine for test case 26(799).

141/47=3

141 is not lucky 47 is lucky

141 gets evenly divided by 47

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4 months ago, # |
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Wont 74 be a lucky number too? one of the solution gives NO for it and it is accepted.

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    3 months ago, # ^ |
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    74 is a lucky number, Test cases might not contain dividend of 74

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