# Latest **URL:** https://discuss.codechef.com/latest.md [Latest](https://discuss.codechef.com/latest.md) · [Categories](https://discuss.codechef.com/categories.md) · [Tags](https://discuss.codechef.com/tags.md) --- ## [BBP controlled XSS validation 20261025-2235](https://discuss.codechef.com/t/bbp-controlled-xss-validation-20261025-2235/126079)
**Author:** [@warm\_fest\_38](https://discuss.codechef.com/u/warm_fest_38)\ **Replies:** 0\ **Last updated:** [October 25, 2026, 10:34pm UTC](https://discuss.codechef.com/t/bbp-controlled-xss-validation-20261025-2235/126079 "2026-10-25T22:34:41Z")
Controlled CodeChef security test. --- ## [Efficient way to compute rolling view counts per video (sliding window) in PHP vs C++?](https://discuss.codechef.com/t/efficient-way-to-compute-rolling-view-counts-per-video-sliding-window-in-php-vs-c/126078)
**Author:** [@tower\_star\_54](https://discuss.codechef.com/u/tower_star_54)\ **Replies:** 0\ **Last updated:** [October 25, 2026, 5:07pm UTC](https://discuss.codechef.com/t/efficient-way-to-compute-rolling-view-counts-per-video-sliding-window-in-php-vs-c/126078 "2026-10-25T17:07:05Z")
I’m building a video sharing platform and need per-video view counts over the last 24h, updated often. Is a ring buffer of hourly buckets the standard sliding-window approach here, and is it worth doing in C++ or is PHP … --- ## [Test processing](https://discuss.codechef.com/t/test-processing/126072)
**Author:** [@demo\_s4](https://discuss.codechef.com/u/demo_s4)\ **Replies:** 0\ **Last updated:** [October 24, 2026, 5:43am UTC](https://discuss.codechef.com/t/test-processing/126072 "2026-10-24T05:43:06Z")
hi there hello there welcome who are you --- ## [EXKEYPAD - Editorial](https://discuss.codechef.com/t/exkeypad-editorial/126049)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 3\ **Last updated:** [October 22, 2026, 1:59pm UTC](https://discuss.codechef.com/t/exkeypad-editorial/126049 "2026-10-22T13:59:56Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: (Optional… --- ## [EXPHOTO - Editorial](https://discuss.codechef.com/t/exphoto-editorial/126050)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exphoto-editorial/126050 "2026-10-21T16:30:56Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Fenwick t… --- ## [EXPRIZE - Editorial](https://discuss.codechef.com/t/exprize-editorial/126051)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exprize-editorial/126051 "2026-10-21T16:30:56Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Binary se… --- ## [EXQUIZ - Editorial](https://discuss.codechef.com/t/exquiz-editorial/126052)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exquiz-editorial/126052 "2026-10-21T16:30:55Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PRO… --- ## [EXBANNER - Editorial](https://discuss.codechef.com/t/exbanner-editorial/126057)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exbanner-editorial/126057 "2026-10-21T16:30:53Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Sorting, … --- ## [EXBANNER2 - Editorial](https://discuss.codechef.com/t/exbanner2-editorial/126061)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exbanner2-editorial/126061 "2026-10-21T16:30:53Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PRO… --- ## [EXBANNERH - Editorial](https://discuss.codechef.com/t/exbannerh-editorial/126062)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exbannerh-editorial/126062 "2026-10-21T16:30:53Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Inclusion… --- ## [BETWEEN - Editorial](https://discuss.codechef.com/t/between-editorial/126059)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/between-editorial/126059 "2026-10-21T16:30:53Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PRO… --- ## [EXSHAKE - Editorial](https://discuss.codechef.com/t/exshake-editorial/126053)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 4:30pm UTC](https://discuss.codechef.com/t/exshake-editorial/126053 "2026-10-21T16:30:53Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: am\_aadvik Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Sorting P… --- ## [Invitation to CodeChef Starters 261 (Rated upto 6 stars) - 21st October](https://discuss.codechef.com/t/invitation-to-codechef-starters-261-rated-upto-6-stars-21st-october/126058)
**Author:** [@jshree\_1029](https://discuss.codechef.com/u/jshree_1029)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 11:44am UTC](https://discuss.codechef.com/t/invitation-to-codechef-starters-261-rated-upto-6-stars-21st-october/126058 "2026-10-21T11:44:02Z")
We invite you to participate in CodeChef’s Starters 261, this Wednesday, 21st October, rated for 6 stars (i.e. for users with rating \< 2500). Time: 8:00 PM — 10:00 PM IST Joining us on the problem setting panel are: … --- ## [Summary Power : What’s wrong with my code?](https://discuss.codechef.com/t/summary-power-what-s-wrong-with-my-code/126056)
**Author:** [@bt23cse026](https://discuss.codechef.com/u/bt23cse026)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 8:36am UTC](https://discuss.codechef.com/t/summary-power-what-s-wrong-with-my-code/126056 "2026-10-21T08:36:49Z")
Summary Power : What’s wrong with my code? #include \ using namespace std; int main() { int t ;cin\>\>t; while(t--){ int n,k;cin\>\>n\>\>k; vector\v(n); vector\c(n); … --- ## [Starters 260 rating not showing](https://discuss.codechef.com/t/starters-260-rating-not-showing/126054)
**Author:** [@ncs\_roblox\_fam](https://discuss.codechef.com/u/ncs_roblox_fam)\ **Replies:** 0\ **Last updated:** [October 21, 2026, 7:38am UTC](https://discuss.codechef.com/t/starters-260-rating-not-showing/126054 "2026-10-21T07:38:48Z")
I participated in Starters 260 a week ago, but today… There was NO display about my participation of Starters 260. And the rating says 1199 instead of 1299 as well!!! I humbly request the admins and workers of C… --- ## [Help me with code and optimisation also if possible](https://discuss.codechef.com/t/help-me-with-code-and-optimisation-also-if-possible/126042)
**Author:** [@worm\_angel\_51](https://discuss.codechef.com/u/worm_angel_51)\ **Replies:** 0\ **Last updated:** [October 17, 2026, 12:48pm UTC](https://discuss.codechef.com/t/help-me-with-code-and-optimisation-also-if-possible/126042 "2026-10-17T12:48:01Z")
PolyAdd https://www.codechef.com/learn/course/tiet-ucs301-dsa-c-2026/KJWHBF26/problems/POLYADDSLL?tab=statement --- ## [My code is correct,still it is showing error](https://discuss.codechef.com/t/my-code-is-correct-still-it-is-showing-error/126041)
**Author:** [@rcpit26199909](https://discuss.codechef.com/u/rcpit26199909)\ **Replies:** 0\ **Last updated:** [October 17, 2026, 10:13am UTC](https://discuss.codechef.com/t/my-code-is-correct-still-it-is-showing-error/126041 "2026-10-17T10:13:58Z")
--- ## [MERGEHD - Editorial](https://discuss.codechef.com/t/mergehd-editorial/126031)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 1\ **Last updated:** [October 15, 2026, 10:56am UTC](https://discuss.codechef.com/t/mergehd-editorial/126031 "2026-10-15T10:56:38Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: NTT PROBLE… --- ## [DIFFGCD - Editorial](https://discuss.codechef.com/t/diffgcd-editorial/126029)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 2\ **Last updated:** [October 14, 2026, 9:05pm UTC](https://discuss.codechef.com/t/diffgcd-editorial/126029 "2026-10-14T21:05:38Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Square root… --- ## [REVMX - Editorial](https://discuss.codechef.com/t/revmx-editorial/126032)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 5:15pm UTC](https://discuss.codechef.com/t/revmx-editorial/126032 "2026-10-14T17:15:46Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Prefix sums… --- ## [MERGEEZ - Editorial](https://discuss.codechef.com/t/mergeez-editorial/126030)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 4:30pm UTC](https://discuss.codechef.com/t/mergeez-editorial/126030 "2026-10-14T16:30:49Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: Dynamic pro… --- ## [WATERMOVE2 - Editorial](https://discuss.codechef.com/t/watermove2-editorial/126034)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 4:30pm UTC](https://discuss.codechef.com/t/watermove2-editorial/126034 "2026-10-14T16:30:47Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PROBL… --- ## [BLUEBLACK - Editorial](https://discuss.codechef.com/t/blueblack-editorial/126037)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 4:30pm UTC](https://discuss.codechef.com/t/blueblack-editorial/126037 "2026-10-14T16:30:47Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PROBL… --- ## [CHANGEONE7 - Editorial](https://discuss.codechef.com/t/changeone7-editorial/126036)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 4:30pm UTC](https://discuss.codechef.com/t/changeone7-editorial/126036 "2026-10-14T16:30:47Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PROBL… --- ## [WATERMOVE - Editorial](https://discuss.codechef.com/t/watermove-editorial/126033)
**Author:** [@iceknight1093](https://discuss.codechef.com/u/iceknight1093)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 4:30pm UTC](https://discuss.codechef.com/t/watermove-editorial/126033 "2026-10-14T16:30:47Z")
PROBLEM LINK: Practice Contest: Division 1 Contest: Division 2 Contest: Division 3 Contest: Division 4 Author: raysh07 Tester: iceknight1093 Editorialist: iceknight1093 DIFFICULTY: TBD PREREQUISITES: None PROBL… --- ## [Invitation to CodeChef Starters 260 (Rated upto 5 stars) - 14th October](https://discuss.codechef.com/t/invitation-to-codechef-starters-260-rated-upto-5-stars-14th-october/126035)
**Author:** [@jshree\_1029](https://discuss.codechef.com/u/jshree_1029)\ **Replies:** 0\ **Last updated:** [October 14, 2026, 12:18pm UTC](https://discuss.codechef.com/t/invitation-to-codechef-starters-260-rated-upto-5-stars-14th-october/126035 "2026-10-14T12:18:12Z")
We invite you to participate in CodeChef’s Starters 260, this Wednesday, 14th October, rated for 5 stars (i.e. for users with rating \< 2200). Time: 8:00 PM — 10:00 PM IST Joining us on the problem setting panel are: … --- ## [Access restricted](https://discuss.codechef.com/t/access-restricted/126027)
**Author:** [@u2511cs010392](https://discuss.codechef.com/u/u2511cs010392)\ **Replies:** 0\ **Last updated:** [October 13, 2026, 8:41am UTC](https://discuss.codechef.com/t/access-restricted/126027 "2026-10-13T08:41:27Z")
Describe your issue access restricted Screenshot Additional info i went back to connect network and my access is restricted --- ## [Monday Munch Difficulty](https://discuss.codechef.com/t/monday-munch-difficulty/126025)
**Author:** [@zirutok](https://discuss.codechef.com/u/zirutok)\ **Replies:** 0\ **Last updated:** [October 12, 2026, 7:03pm UTC](https://discuss.codechef.com/t/monday-munch-difficulty/126025 "2026-10-12T19:03:37Z")
The last couple of Monday Munches were easier than previous contests. In my opinion the difficulty could be increased a bit or some easyish problems to some non-standard data structures and algorithms could be given. --- ## [I am not doing any cheating in Monday contest](https://discuss.codechef.com/t/i-am-not-doing-any-cheating-in-monday-contest/126023)
**Author:** [@parthrastogi23](https://discuss.codechef.com/u/parthrastogi23)\ **Replies:** 0\ **Last updated:** [October 11, 2026, 6:28pm UTC](https://discuss.codechef.com/t/i-am-not-doing-any-cheating-in-monday-contest/126023 "2026-10-11T18:28:32Z")
In ques of tree like where i learn this concept they use these variables so i use same variables as it is .I dont know like this is classified as cheating. Sorry but this thing I dont know. Sorry give me last chance from… --- ## [BattleShip V EDITORIAL](https://discuss.codechef.com/t/battleship-v-editorial/8984)
**Author:** [@namankumar](https://discuss.codechef.com/u/namankumar)\ **Replies:** 1\ **Last updated:** [October 9, 2026, 7:33am UTC](https://discuss.codechef.com/t/battleship-v-editorial/8984 "2026-10-09T07:33:42Z")
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