OK, great. I guess CommonLounge has evolved a lot from the last time I opened it.
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If you want to use Java, be prepared for lots of optimisation, Java has a much bigger library than C++, but that also makes it take a bit more time and memory.
Optimisations you probably need for contests
- Use BufferedReader and BufferedWriter or PrintWriter instead of Scanner.
- If you need to use an array after sorting make sure it is an object array and not primitve types, Integer[] instead of int[],etc. because Java's sorting method for primivitives could degrade.
- Always close your BufferedWriter in the end to make sure that what you've typed is written to the console.
- To save time, use as many of Java8's new shortcuts.
- Unlike C++, you do have builtin regex support, that is compiler independent.
- Use a try catch block instead of throws.
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Don't use hundereds of defines, ifdefs, ifndefs; to confuse your preprocessor and more importantantly confuse yourself at times.
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I don't prefer pointers at all. Look up Row Major Order and Column Major Order possibly for address calculation.
a[i][j] \text{is at} B + W[N(i-l_r) + (j-l_c)] \text{ in RMO}
a[i][j] \text{ is at } B + W[(i-l_r) + M(j-l_c)] \text{ in CMO }
\text{where a is the array of M rows and N columns, B is the base address, W is the size of an element} l_r \text{ and } l_c \text{ are zero in regular cases}
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Doing that in centre isn't that easy especially if you aren't allowed to do that and you don't know using Ubuntu except for a bit of the the BAsh.
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I found yesterday that both my original programs gave the correct output at least on the given testcases; had I not tried to edit them to be able to compile on that machine, and fail at it to get a zero possibly by some CE or other error as a result. Will also post my code after 31st to help me figure out if I was wrong somewhere in my logic.
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What's worse is ending up with nothing despite having figured out the correct strategy.
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