111 - History Grading

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Your program gives wrong output for second sample

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6
4
10
5
5
5
5
5
5

Your program reads n - 1 lines to find lcs. Instead of this it must read until exists lines. Check second sample there are only 4 answers not 9.

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6
5
10
9

You misunderstood problem. Read this thread

Check the following thread...
http://online-judge.uva.es/board/viewtopic.php?t=7879

And change this

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 cout<<"\n"<<lcs(arr1,arr2,n,n);

It must be

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 cout<<lcs(arr1,arr2,n,n)<<"\n";