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Efficient solution to add / sum problem
We have n points (xi, yi). Let both x and y be different and from [1, n].
Initially, all points have zero value.
Two types of queries:
1) add X — adding +1 to all points with xi ≤ X
2) sum Y — calculate sum of values of points with yi ≤ Y
What is best known solution? (Problem not from running contest).
