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Sphere Online Judge (SPOJ)
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Discuss SPOJ problems and solutions, and other SPOJ related stuff.
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1.
discussion
[BAT2] Batman2by Annu Purohit
Need idea: I thought of finding all possible increasing and decreasing subsequences which is too slow. Can this be done efficiently? Also according to me there can be at max 1 element in common in both the subsequences. I am not getting how to use this information.
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2.
discussion
[SPOJ AGGRCOW] Aggressive cows!by Shashwat Chandra
Can someone please give me some hints to solve this problem. Thanks in Advance!!
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3.
discussion
[ALTSEQ] Alternating Sequencesby Swetanjal Datta
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4.
discussion
[RENT] Rent your airplane and make moneyby Himanshu Jaju
This problem is from ACM Southwestern European Regional Contest, Paris 2003
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5.
discussion
[SUMSUM] Enjoy Sum with Operationsby Priyam Kakati
Need idea: Tried to solve it using bitmask + segment tree, but getting WA. Any idea about how to solve this problem efficiently?
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6.
discussion
[AIBOHP] Aibohphobiaby Swetanjal Datta
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