latex打出算法复杂度里的O波浪线

\tilde{O}
O ~ \tilde{O} O~

来源：https://tex.stackexchange.com/questions/66418/tilde-over-a-symbol-phi

标签：latex,66418,复杂度,算法,questions,tilde,over
来源： https://blog.csdn.net/qq_41961459/article/details/120811442