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/// 博士升级需要的所有数据
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct DoctorLevelUpDB {}

impl Default for DoctorLevelUpDB {
    fn default() -> Self {
        Self {}
    }
}

impl DoctorLevelUpDB {
    ///
    pub fn cost(&self, from: usize, to: usize) -> Result<usize, String> {
        Ok(0)
    }
}