From 6ea6f9c1c60c7025e0b7bdc95a5d5aa395eedfbc Mon Sep 17 00:00:00 2001 From: Anthony Wang Date: Thu, 20 Oct 2022 00:33:23 -0400 Subject: [PATCH] Rename to SDC --- README.md | 14 +++++++------- cd.c => sd.c | 0 2 files changed, 7 insertions(+), 7 deletions(-) rename cd.c => sd.c (100%) diff --git a/README.md b/README.md index 6a8af2a..360f429 100644 --- a/README.md +++ b/README.md @@ -1,25 +1,25 @@ -# CD +# SDC -C port of [SD](https://git.exozy.me/Ta180m/SD), a very efficient flash cards app +C port of [SD](https://git.exozy.me/a/SD), a very efficient flash cards app ## Usage Flash cards are stored in the `cards` table of a SQLite database. There are four columns: `idx INTEGER PRIMARY KEY, weight INTEGER, key STRING, val STRING`. The `idx` is a unique index for each card, starting at 0. The weight is how often the card should come up. The key and value are the front and reverse sides of the card. You can use the `sqlite3` CLI to create a card deck. -Now build this project with `gcc cd.c segmenttree.c -o cd -lsqlite3 -O2 -march=native` and run `./cd` to enjoy a fast flash cards experience! The program will display the `key` of a randomly selected card. Press any key to show the `val` of the card. Now press either `y` or `n` depending on whether you got the card correct, and the program adjusts that card's weight. +Now build this project with `gcc sd.c segmenttree.c -o sd -lsqlite3 -O2 -march=native` and run `./sd` to enjoy a fast flash cards experience! The program will display the `key` of a randomly selected card. Press any key to show the `val` of the card. Now press either `y` or `n` depending on whether you got the card correct, and the program adjusts that card's weight. -If you're wondering where the name came from, this is the C port of [SD](https://git.exozy.me/Ta180m/SD). +If you're wondering where the name came from, this is the C port of [SD](https://git.exozy.me/a/SD), which was named after a common type of flash card. 😀 ## Performance -CD is designed to be extremely efficient in order to support a very large number of flash cards and should be able to handle millions of cards with ease. If `N` is the number of cards, initializing the program requires `O(N)` time and `O(N)` memory. Selecting a random card and adjusting its weight requires `O(log N)` time. Internally CD uses [segment trees](https://en.wikipedia.org/wiki/Segment_tree) to achieve this time complexity. +SD is designed to be extremely efficient in order to support a very large number of flash cards and should be able to handle millions of cards with ease. If `N` is the number of cards, initializing the program requires `O(N)` time and `O(N)` memory. Selecting a random card and adjusting its weight requires `O(log N)` time. Internally SD uses [segment trees](https://en.wikipedia.org/wiki/Segment_tree) to achieve this time complexity. Some benchmark results using 10 card updates: ``` -Benchmark 1: ./cd < test +C version: ./sd < test Time (mean ± σ): 57.4 ms ± 4.5 ms [User: 6.9 ms, System: 2.4 ms] Range (min … max): 51.9 ms … 70.9 ms 41 runs -Benchmark 2: ./sd < test +Go version: ./sd < test Time (mean ± σ): 92.7 ms ± 6.8 ms [User: 8.4 ms, System: 4.5 ms] Range (min … max): 79.4 ms … 108.9 ms 33 runs ``` diff --git a/cd.c b/sd.c similarity index 100% rename from cd.c rename to sd.c