perm = ['+3', '+4', '+5', '-12', '-8', '-7', '-6', '+1', '+2', '+10', '+9', '-11', '+13', '+14'] def number_of_breakpoints(perm): ''' Find the number of breakpoints in a permutation. Input: A permutation. Output: The number of breakpoints in this permutation. ''' breakpoints = 0 if int(perm[0]) - 0 != 1: breakpoints += 1 for index in range(1, len(perm)): if int(perm[index]) - int(perm[index - 1]) != 1: breakpoints += 1 if len(perm) + 1 - int(perm[- 1]) != 1: breakpoints += 1 return breakpoints print number_of_breakpoints(perm)
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