CodeDrills — A new online judge

Revision en10, by Balajiganapathi, 2020-03-31 17:48:25

We are going through an unprecedented situation currently. There are lockdowns and quarantines in many parts of the world. We feel the best way to cope with everything that is going on is to keep ourselves occupied.

To help with that, we at CodeDrills have something for all the competitive coders out there. On 25th March, we launched our own online judge and also launched the CodeDrills covid 21 days challenge. Every day, for the 21 days starting from 25th March, we will upload 1 problem. Just visit, login and start solving! The launch coincided with the start of a full lockdown in India.

Since the situation was unexpected, we rushed to put up the site as soon as possible, so there might be issues. If you find any bugs or want to request a feature, please write to us at [email protected] with as much details as possible.

Here is our mascot Ufu wearing a mask (if you are unable to see him here, head over to our page):

Here are the problems launched so far:

Day Problem link
1 Beating Shell sort
2 Curfew delivery
3 Book stacks
4 Square-free subarrays
5 Cookie supply
6 Count of arrays with given LIS length
7 Longest balanced symmetric subsequence

PS: The old code-drills site is still available at

PPS: We don't have all the 21 problems yet, if you have a problem idea please contact us

Tags onlinejudge, codedrills


  Rev. Lang. By When Δ Comment
en19 English Balajiganapathi 2020-04-14 19:51:06 96
en18 English Balajiganapathi 2020-04-13 20:49:57 104
en17 English Balajiganapathi 2020-04-12 17:20:09 328
en16 English Balajiganapathi 2020-04-08 19:35:29 102
en15 English Balajiganapathi 2020-04-07 17:52:22 71
en14 English Balajiganapathi 2020-04-06 18:52:36 254
en13 English Balajiganapathi 2020-04-03 18:23:20 95
en12 English Balajiganapathi 2020-04-03 18:19:49 153 Add day 9+10 problems
en11 English Balajiganapathi 2020-04-01 17:03:04 130 Added Day 8 problem
en10 English Balajiganapathi 2020-03-31 17:48:25 96 Added Day 7 problem
en9 English Balajiganapathi 2020-03-30 18:27:00 0 (published)
en8 English Balajiganapathi 2020-03-30 18:25:10 12 Tiny change: 'all the coders o' -> 'all the competitive coders o'
en7 English Balajiganapathi 2020-03-30 18:02:51 101
en6 English Balajiganapathi 2020-03-30 18:01:06 176 Tiny change: 'ble.\n\nHere is our ma' -> 'ble.\n\nHead over is our ma'
en5 English Balajiganapathi 2020-03-30 17:55:59 53
en4 English Balajiganapathi 2020-03-30 17:54:59 1 Tiny change: 'k_guy.png")\n\nHere ' -> 'k_guy.png">)\n\nHere '
en3 English Balajiganapathi 2020-03-30 17:54:18 170
en2 English Balajiganapathi 2020-03-30 17:51:26 150
en1 English Balajiganapathi 2020-03-30 17:48:50 1505 Initial revision (saved to drafts)