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- from math import sqrt
- n=int(input())
- a,q = [],dict()
- s=0
- for i in range(n):
- a.append([int(j) for j in input().split()])
- for j in range(i):
- naz=str(j)+str(i)
- q[naz]=((a[i][0]-a[j][0])**2+(a[i][1]-a[j][1])**2)
- for l in range(j):
- if q[str(j)+str(i)]==q[str(l)+str(j)]+q[str(l)+str(i)] or q[str(l)+str(j)]==q[str(j)+str(i)]+q[str(l)+str(i)] or q[str(l)+str(i)]==q[str(l)+str(j)]+q[str(j)+str(i)]:
- s+=1
- print(s)
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