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Jul 21st, 2018
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  1. def equi ( A ):
  2. sum_before = 0
  3. sum_after = sum(A)
  4. for i in xrange(len(A)):
  5. sum_after -= A[i]
  6. if(sum_before == sum_after):
  7. return i
  8. sum_before += A[i]
  9. return -1
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