human
Count of collisions at a point ( X , Y ) | Function to find the count of possible pairs of collisions.
Stores the time at which points reach the origin.
Calculate time for each point.
Sort the times.
Counting total collisions.
Count of elements arriving at a given point at the same time.
Driver Code.
Given set of points with speed.
Function Call"
How can the above be solved in Python?
 ... Write me a code to count of collisions at a point ( X , Y ) and the other steps required?
assistant
#Here is code to count of collisions at a point ( X , Y ) and the other steps required.
 def solve ( D , N , X , Y ) :
	T = [ ]
	for i in range ( N ) :
		x = D [ i ] [ 0 ]
		y = D [ i ] [ 1 ]
		speed = D [ i ] [ 2 ]
		time = ( ( x * x - X * X ) + ( y * y - Y * Y ) ) / ( speed * speed )
		T . append ( time )
	T . sort ( )
	i = 0
	total = 0
	while i < len ( T ) - 1 :
		count = 1
		while i < len ( T ) - 1 and T [ i ] == T [ i + 1 ] :
			count += 1
			i += 1
		total += ( count * ( count - 1 ) ) / 2
		i += 1
	return total
N = 5
D = [ [ 5 , 12 , 1 ] , [ 16 , 63 , 5 ] , [ - 10 , 24 , 2 ] , [ 7 , 24 , 2 ] , [ - 24 , 7 , 2 ] ]
X = 0
Y = 0
print ( solve ( D , N , X , Y ) )