Problem E
Sunlight
A core right in Roman tenancy law was the availability of sunlight to everybody, regardless of status. Good sun exposure has a number of health benefits, many of which were known even in those ancient times.
The first act of a Roman city plan reviewer, then, is to survey the proposed structures to measure how well they distribute this precious resource. Given any one avenue of buildings arranged WesttoEast, the number of hours for which each building is exposed to sunlight needs to be determined.
For the purpose of simplicity, the number of hours a building is in sunlight is proportional to the fraction of the $180$ degrees of sky visible from its top. Thanks in no small part to the marvels of ancient engineering (and also to the strict nutritional regimes of old) you may assume each building is infinitesimally thin.
Input

One line containing one integer $N$ ($1 \leq N \leq 2 \cdot 10^5$): the number of buildings.

$N$ further lines each containing two spaceseparated integers $X_ i$ and $H_ i$ ($1 \leq X, H \leq 10^9$), the location and height respectively, in metres, of the $i^{th}$most building from the west.
Output
On each of the $N$ lines of output, write one real number to at least 4 decimal places of accuracy: the number of hours for which the peak of the $i$th building is bathed in sunlight.
Sample Input 1  Sample Output 1 

4 1 1 2 2 3 2 4 1 
9.0000 12 12.00000 9.0 
Sample Input 2  Sample Output 2 

5 100 50 125 75 150 100 175 125 200 25 
9.0 9.0 9.0 12.0 6.9357496 