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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of significant accounting policies |
Schedule of estimated useful lives of property, equipment and software |
Category |  | Estimated useful lives
Electronic equipment |  | 3-5 years
Office equipment |  | 5 years
Vehicles |  | 5 years
Logistic and warehouse equipment |  | 5-10 years
Leasehold improvement |  | Over the shorter of the expected life of leasehold improvements or the lease term
Software |  | 3-5 years
Building |  | 40 years
Building improvement |  | 5-10 years
Schedule of estimated useful lives of intangible assets |
Category |  | Estimated useful lives
Strategic Cooperation |  | 5 years
Non-compete |  | 5-8 years
Technology |  | 2-7 years
Domain names and trademarks |  | 5-20 years
Others |  | 2-10 years
ASU 2016-18 |
Summary of significant accounting policies |
Schedule of impacts on consolidated statements of cash flows |
Year ended December 31, 2016 |  | Previously reported |  | Adjustments |  | As Revised
|  | RMB |  | RMB |  | RMB
Net cash provided by operating activities |  | 8,767,017 |  | (526,646) |  | 8,240,371
Net cash used in investing activities |  | (48,268,577) |  | 2,787,142 |  | (45,481,435)
Net cash provided by financing activities |  | 40,699,471 |  | — |  | 40,699,471
Effect of exchange rate changes on cash, cash equivalents, and restricted cash |  | 709,916 |  | 16,546 |  | 726,462
Net increase in cash, cash equivalents, and restricted cash |  | 1,907,827 |  | 2,277,042 |  | 4,184,869
Year ended December 31, 2017 |  | Previously reported |  | Adjustments |  | As Revised
|  | RMB |  | RMB |  | RMB
Net cash provided by operating activities |  | 24,821,273 |  | 2,035,454 |  | 26,856,727
Net cash used in investing activities |  | (37,498,092) |  | (2,317,199) |  | (39,815,291)
Net cash provided by financing activities |  | 19,234,985 |  | — |  | 19,234,985
Effect of exchange rate changes on cash, cash equivalents, and restricted cash |  | (641,534) |  | — |  | (641,534)
Net increase in cash, cash equivalents, and restricted cash |  | 5,916,632 |  | (281,745) |  | 5,634,887

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