Javascript developer

Given a curve whose edges are parallel to either X-axis or Y-axis, you need to find the area under this curve along the X-axis. The curve will be given in the form of a linked list containing N nodes, where each node represents the coordinates of the curve.

The area under the curve along the X-axis is defined as the total area covered by the curve and the line Y = 0. See the sample explanation figure below for further clarification.

Note

1. The coordinates will be given in non-descending order of X coordinate from start to end of the linked list.

2. All the coordinates will be pairwise distinct i.e there are no two coordinates (X1, Y1) and (X2, Y2) such that X1 =  X2 and Y1 = Y2 and there will be an edge between every two consecutive coordinates.

3. The first coordinate and the last coordinate in the input can be assumed as the starting point and the ending point of the curve respectively and there will not be an edge between these two coordinates.

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