An algorithm problem

question: there are two actions for a user to invest and refund (for example, if An invests 100000 yuan, then he will get a rebate of 10 yuan after maturity). When the user does not make any investment within 6 months, the next investment will be regarded as the first investment (reset in the investment time). Now there is a demand. Given any time, it is necessary to calculate the year of the user"s investment.

I really can"t figure it out.

Scala java
Jul.11,2022

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b366af-2c01e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b366af-2c01e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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