

from __future__ import annotations






def 					__lowercase      (     _A						,    _A						,    _A						,    )     ->						tuple:
      if (electron_conc, hole_conc, intrinsic_conc).count(0			) != 1:
            raise ValueError("""You cannot supply more or less than 2 values"""			)
      elif electron_conc < 0:
            raise ValueError("""Electron concentration cannot be negative in a semiconductor"""			)
      elif hole_conc < 0:
            raise ValueError("""Hole concentration cannot be negative in a semiconductor"""			)
      elif intrinsic_conc < 0:
            raise ValueError(
                """Intrinsic concentration cannot be negative in a semiconductor"""			)
      elif electron_conc == 0:
            return (
                "electron_conc",
                intrinsic_conc**2 / hole_conc,
            )
      elif hole_conc == 0:
            return (
                "hole_conc",
                intrinsic_conc**2 / electron_conc,
            )
      elif intrinsic_conc == 0:
            return (
                "intrinsic_conc",
                (electron_conc * hole_conc) ** 0.5,
            )
      else:
            return (-1, -1)


if __name__ == "__main__":
  import doctest

  doctest.testmod()







def 					__lowercase      (     _A = 50			)     ->						int:
      SCREAMING_SNAKE_CASE :      Tuple       =   [1] * (length + 1)

      for row_length in range(3						,    length + 1			):
            for block_length in range(3						,    row_length + 1			):
                  for block_start in range(row_length - block_length			):
                        ways_number[row_length] += ways_number[
                            row_length - block_start - block_length - 1
                        ]

                  ways_number[row_length] += 1

      return ways_number[length]


if __name__ == "__main__":
  print(F"""{solution() = }""")




