Hey just studied BIT from http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=binaryIndexedTrees but couldnot understand how to know to calculate tree[idx],it must be question dependent ?? So how to know what value to keep in that like was solving http://www.spoj.com/problems/MSE06H/ but could not get what value to store at the tree[idx] plzzz help guys..
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