Hello Fellow Coders,

Warm and pleasant greetings from Coding Club, IIT Ropar.

With utmost zest, we want to announce that our club is organizing some exciting programming-driven events under our Annual Techno-Cultural Fest – ZEITGEIST. (zeitgeist.org.in)

The event details are as follows:

1. COD-COM: A 3-stage coding tournament with prizes worth 30k. (Team event)
   Registration link: Unstop | Townscript
2. Algo-Unlock: A 2-stage reverse coding-based event with prizes worth 16k. (Individual event)
   Registration link: Unstop | Townscript
3. Code-Hunt: A single-stage treasure hunt-based event with prizes worth 27k. (Team event)
   Registration link: Unstop | Townscript

Important:

1. The 1st Stage of COD-COM is in online mode on CodeChef on 16th March’23 from 8:00 PM to 10:15 PM IST. (Note: The contest will follow ICPC rules).

2. The 1st Stage of Algo-Unlock is in online mode on Codeforces on 17th March’23 from 9:00 PM to 11:00 PM IST.

NOTE:

• Further details & rulebooks can be found and downloaded through the registration links or through the official site of Zeitgeist (https://zeitgeist.org.in/).
• Contest link will be shared with your registered email IDs. So, please make sure you register for the events.

Update:

• COD-COM contest link: https://www.codechef.com/CODO2023
• Algo-Unlock contest link: https://codeforces.me/contestInvitation/7e6c4114294232d26c3b268202c66324fa66f28c

I submitted my code for 1612E - Сообщения in different C++ compilers and here are the results:

1. C++14 — 138535056 — Accepted (1481 ms)
2. C++17 (64) — 138534883 — TLE (3000 ms)
3. C++17 — 138534840 — Accepted (1559 ms)
4. C++20 (64) 138534744 — TLE (3000 ms)

All 4 are the same codes. I can understand that there can be minor differences in time taken, but here the difference is around 1.5 ms. I mostly code in python and don't have much idea on performance differences between different C++ compilers.

As far as I can think, int operations are faster in C++ while long long operations are faster in C++ (64). But still, the difference is huge. Is there any other reason and how to decide appropriate C++ compiler?

Please have a look at the following two submissions of 1582E - Пчеленок и подотрезки:

1. 138848779
2. 138849288

The first submission gave RTE on test 8. But just by replacing ll with int, it passed test 8. (Though it failed on test 9 due to integer overflow). Can anyone tell why is the first submission giving RTE? Any help is appreciated.

C++ is not my primary language, so I may be making some silly errors.