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file 1028 lines (1023 sloc) 28.096 kb
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"""
DataStructure Point
Technique same side of line
Also this can be easily solved by checking cross product
"""

l = """
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"""

def hasorigin(x,y,z):
    return same(x,y,z) and same(z,x,y) and same(y,z,x)
def samesideasorigin(x,y,z):
    return sameside(x[0],x[1],y[0],y[1],z[0],z[1])
def sameside(x1,y1,x2,y2,x3,y3):
    def f(x,y): #Equation of line passing through pt1 and pt2
        return (x-x1)*(y2-y1) - (y-y1)*(x2-x1)
    return (f(0,0)*f(x3,y3)) > 0


count = 0
for i in l.split('\n'):
    j = i.strip()
    if j != "":
        k = [int(_k) for _k in j.split(',')]
        if hasorigin( (k[0],k[1]) , (k[2],k[3]) , (k[4],k[5]) ):
            count += 1
        
print count
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