-
Notifications
You must be signed in to change notification settings - Fork 7
/
collidingtraffic.py
28 lines (28 loc) · 1.03 KB
/
collidingtraffic.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
from math import *
import sys; input = sys.stdin.readline
for _ in range(int(input())):
n, r = map(float, input().split()); n = round(n)
bb = []
for _ in range(n):
x, y, d, s = map(float, input().split())
a = (90-d)*pi/180
bb.append((x, y, s*cos(a), s*sin(a)))
best = 1e9
for i in range(n-1):
x1, y1, dx1, dy1 = bb[i]
for j in range(i+1, n):
x2, y2, dx2, dy2 = bb[j]
a = (dx1-dx2)**2+(dy1-dy2)**2
b = 2*((x1-x2)*(dx1-dx2)+(y1-y2)*(dy1-dy2))
c = (x1-x2)**2+(y1-y2)**2-r*r
d = b*b-4*a*c
if d < 0: continue
if c < 0: best = 0; continue
if abs(a) < 1e-8:
if abs(b) > 1e-8: t1 = t2 = -c/b
else: continue
else: t1, t2 = (-b-d**0.5)/(2*a), (-b+d**0.5)/(2*a)
if t1 < 0 and t2 >= 0: best = min(best, t2)
elif t1 >= 0: best = min(best, t1)
if best == 1e9: print('No collision.')
else: print(round(best))