F. Nagini
binary search; data structures
Nagini, being a horcrux You-know-who created with the murder of Bertha Jorkins, has accumulated its army of snakes and is launching an attack on Hogwarts school. Hogwarts' entrance can be imagined as a straight line (x-axis) from 1 to 105. Nagini is launching various snakes at the Hogwarts entrance. Each snake lands parallel to the entrance, covering a segment at a distance k from x = l to x = r. Formally, each snake can be imagined as being a line segment between points (l, k) and (r, k). Note that k can be both positive and negative, but not 0.Let, at some x-coordinate x = i, there be snakes at point (i, y1) and point (i, y2), such that y1 > 0 and y2 < 0. Then, if for any point (i, y3) containing a snake such that y3 > 0, y1 ≤ y3 holds and for any point (i, y4) containing a snake such that y4 < 0, |y2| ≤ |y4| holds, then the danger value at coordinate x = i is y1 + |y2|. If no such y1 and y2 exist, danger value is 0. Harry wants to calculate the danger value of various segments of the Hogwarts entrance. Danger value for a segment [l, r) of the entrance can be calculated by taking the sum of danger values for each integer x-coordinate present in the segment.Formally, you have to implement two types of queries: 1 l r k: a snake is added parallel to entrance from x = l to x = r at y-coordinate y = k (l inclusive, r exclusive). 2 l r: you have to calculate the danger value of segment l to r (l inclusive, r exclusive).
First line of input contains a single integer q (1 ≤ q ≤ 5·104) denoting the number of queries.Next q lines each describe a query. Each query description first contains the query type typei (1 ≤ typei ≤ 2). This is followed by further description of the query. In case of the type being 1, it is followed by integers li, ri and ki (, - 109 ≤ ki ≤ 109, k ≠ 0). Otherwise, it just contains two integers, li and ri (1 ≤ li < ri ≤ 105).
Output the answer for each query of type 2 in a separate line.
In the first sample case, the danger value for x-coordinates 1 is 0 as there is no y2 satisfying the above condition for x = 1.Danger values for x-coordinates 2 and 3 is 10 + | - 7| = 17.Danger values for x-coordinates 4 to 9 is again 0 as there is no y2 satisfying the above condition for these coordinates.Thus, total danger value is 17 + 17 = 34.