adarsh000321's blog

Strange Behavior Of Recursive DP
By adarsh000321, history, 7 years ago, In English

Hello Codeforces, I actually have two codes (69520703 and 69521121) that are doing the same thing but i just changed the order of the states and one of them is giving TLE (at test case: 78)and the other got AC. Can you please help me out. Dislike if you want but please reply :)

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7 years ago, hide # |
 
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Could Someone take a look at it. I've been stuck here for more than 4 hours. Please

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7 years ago, hide # |
 
Vote: I like it +10 Vote: I do not like it

I'm guessing cache.

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7 years ago, hide # |
 
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Cache friendliness is one possible reason.

Another reason would be that in Java, memory of a multidimensional array are not allocated in a contiguous block, so new int[a][2] would create a small blocks of memory each contains a int[2]. In comparison with new int[2][a], that's a lot slower.

new int[2*a] should be faster (but also harder to read)

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