[3.12] gh-113664: Improve style of Big O notation (GH-113695) (GH-113909)

Use cursive to make it looking like mathematic formulas.
(cherry picked from commit a8629816c6c0e6770248a60529fd7c9ba08aad55)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Miss Islington (bot) committed 2y ago

082998c3af5bfd163da5c0198cd10acf588a44ba

Parent: 7530c61

Committed by GitHub <noreply@github.com> on 1/10/2024, 1:08:08 PM