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Oct 20th, 2019
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  1. from math import sqrt
  2. n=int(input())
  3. a,q = [],dict()
  4. s=0
  5. for i in range(n):
  6. a.append([int(j) for j in input().split()])
  7. for j in range(i):
  8. naz=str(j)+str(i)
  9. q[naz]=((a[i][0]-a[j][0])**2+(a[i][1]-a[j][1])**2)
  10. for l in range(j):
  11. 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)]:
  12. s+=1
  13. print(s)
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