Tanmoy1228's blog

2D BIT problem
By Tanmoy1228, 9 years ago, In English

problem: (http://www.spoj.com/problems/MATSUM/)

code: (http://ideone.com/4cPZi4)

Verdict: WA

can not get why WA.

please help...

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9 years ago, # |
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Mistake is in 51-th line — value of ans calculated wrong. It should be ans=quary(x1+1,y1+1)-quary(x1,y1+1)-quary(x1+1,y1)+quary(x1,y1);

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