ModInt.opBinary

We can handle it as same as int(but divide is slow)

  1. auto opBinary(ModInt r)
  2. auto opBinary(ModInt r)
    struct ModInt(uint MD)
    opBinary
    const
    (
    string op : "-"
    )
    if (
    MD < int.max
    )
  3. auto opBinary(ModInt r)
  4. auto opBinary(ModInt r)
  5. auto opBinary(T r)

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