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Cash and cash equivalents - Presented in currency (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents in currencies        
Cash and cash equivalents ¥ 1,907,776 ¥ 1,399,370 ¥ 3,055,194 ¥ 1,077,875
USD        
Cash and cash equivalents in currencies        
Cash and cash equivalents 313,559 72,093    
RMB        
Cash and cash equivalents in currencies        
Cash and cash equivalents 1,045,135 554,781    
HKD        
Cash and cash equivalents in currencies        
Cash and cash equivalents 530,861 763,126    
SGD        
Cash and cash equivalents in currencies        
Cash and cash equivalents 13,821 7,335    
IDR        
Cash and cash equivalents in currencies        
Cash and cash equivalents 1,680 473    
MYR        
Cash and cash equivalents in currencies        
Cash and cash equivalents 1,585 164    
PHP        
Cash and cash equivalents in currencies        
Cash and cash equivalents ¥ 1,135 ¥ 1,398