map<string,int>a={{"ShunZhi", 1644} ,{"KangXi", 1662} ,{"YongZheng", 1723} ,{"QianLong", 1736} ,{"JiaQing", 1796} ,{"DaoGuang", 1821} ,{"XianFeng", 1851} ,{"TongZhi", 1862} ,{"GuangXu", 1875} ,{"XuanTong", 1909}};

記得自己減1