Virtual Participated on Aug 13, 2020.

• Solved 3 out of 13 problems
• Solved 4 out of 13 afterwards

(√ for solved during VP, ○ for after VP, - for tried but not solved)

这个线性基的处理还是很妙的，后面的贪心地把前面的基替换掉，再把换出来的重新尝试插入。

ptw：

• 开始了开始了，自闭的味道