human
Write me a code to count of intersections of M line segments with N vertical lines in XY plane and the other steps required given the following:
Count of intersections of M line segments with N vertical lines in XY plane | Function to create prefix sum array.
Initialize the prefix array to remove garbage values.
Marking the occurances of vertical lines.
Creating the prefix array.
Function that returns the count of total intersection.
ans is the number of points of intersection of the line segments with the vertical lines.
Index mapping.
we don 't consider a vertical   line segment because even if  it falls on a vertical line  then it just touches it and  not intersects..
We have assumed that x1 will be left and x2 right but if not then just swap.
Number of vertical lines.
Number of line segments.
Format : x1 , y1 , x2 , y2.
First create the prefix array.
Print the total number of intersections"
How can the above be solved in Python?
assistant
#Here is code to count of intersections of M line segments with N vertical lines in XY plane and the other steps required.
 def createPrefixArray ( n , arr , prefSize , pref ) :
	for i in range ( prefSize ) :
		pref [ i ] = 0
	for i in range ( n ) :
		x = arr [ i ] + 1000000
		pref [ x ] += 1
	for i in range ( 1 , prefSize ) :
		pref [ i ] += pref [ i - 1 ]
def pointOfIntersection ( m , segments , size , pref ) :
	ans = 0
	for i in range ( m ) :
		x1 = segments [ i ] [ 0 ]
		x2 = segments [ i ] [ 2 ]
		x1 = x1 + 1000000
		x2 = x2 + 1000000
		if ( x1 != x2 ) :
			if ( x1 > x2 ) :
				x1 , x2 = x2 , x1
			Occ_Till_Right = pref [ x2 - 1 ]
			Occ_Till_Left = pref [ x1 ]
			ans += ( Occ_Till_Right - Occ_Till_Left )
	return ans
N = 4
M = 8
size = 2000000 + 2
pref = [ 0 ] * size
lines = [ - 5 , - 3 , 2 , 3 ]
segments = [ [ - 2 , 5 , 5 , - 6 ] , [ - 5 , - 2 , - 3 , - 5 ] , [ - 2 , 3 , - 6 , 1 ] , [ - 1 , - 3 , 4 , 2 ] , [ 2 , 5 , 2 , 1 ] , [ 4 , 5 , 4 , - 5 ] , [ - 2 , - 4 , 5 , 3 ] , [ 1 , 2 , - 2 , 1 ] ]
createPrefixArray ( N , lines , size , pref )
print ( pointOfIntersection ( M , segments , size , pref ) )