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[SUMSUM] Enjoy Sum with Operations

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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Problem SUMSUM
http://spoj.com/problems/SUMSUM/
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[GSS1] Can you answer these queries 1
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About the author:
PK
Priyam Kakati
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About the author
PK
Priyam Kakati
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