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Cash flow information - Non cash investing and financing activities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flow information      
Acquisition of rightofuse properties by leasing (Note 14) ¥ 58,238 ¥ 21,612 ¥ 76,534