def convert_year_to_wareki(year):
wareki_start_year = {
'明治': 1868, '大正': 1912, '昭和': 1926, '平成': 1989, '令和': 2019
}
if year < wareki_start_year['大正']:
return f"(明治{year - wareki_start_year['明治'] + 1}年)"
elif year == wareki_start_year['大正']:
return f"(明治{year - wareki_start_year['明治'] + 1}年/大正{year - wareki_start_year['大正'] + 1}年)"
elif year < wareki_start_year['昭和']:
return f"(大正{year - wareki_start_year['大正'] + 1}年)"
elif year == wareki_start_year['昭和']:
return f"(大正{year - wareki_start_year['大正'] + 1}年/昭和{year - wareki_start_year['昭和'] + 1}年)"
elif year < wareki_start_year['平成']:
return f"(昭和{year - wareki_start_year['昭和'] + 1}年)"
elif year == wareki_start_year['平成']:
return f"(昭和{year - wareki_start_year['昭和'] + 1}年/平成{year - wareki_start_year['平成'] + 1}年)"
elif year < wareki_start_year['令和']:
return f"(平成{year - wareki_start_year['平成'] + 1}年)"
elif year == wareki_start_year['令和']:
return f"(平成{year - wareki_start_year['平成'] + 1}年/令和{year - wareki_start_year['令和'] + 1}年)"
else:
return f"(令和{year - wareki_start_year['令和'] + 1}年)"