Errichto Hard Algorithms
Algorithms, competitive programming, coding interviews. I make educational videos and coding live streams, always sharing my thought process.
My name is Kamil Dębowski (or Errichto) and I'm quite good at competitive programming. I'm a finalist of multiple big programming competitions like ICPC, Facebook Hacker Cup and Google Code Jam (even got 2nd place in 2018). I also organize competitions, which means inventing and preparing problems.
My main channel is Errichto.
My Linux & Geany Setup 2025 | stream from 27.06.2025
CSES Robot Path live coding
Codeforces/CSES live coding
CF Div. 1/2 Group Lesson - Train Maintenance
CF 745 Screencast
Facebook Hacker Cup 2021 Round 2, Full Score (kind of)
Codeforces Deltix (Div. 1+2) Screencast
Codeforces 722 Screencast (back to LGM!)
Google Hash Code 2021 Finals (would be 6th place with 3 extra minutes)
Codeforces 718 (Div. 1 + 2)
(4 место) Leetcode Biweekly 44
Codechef Nov Lunchtime Screencast
Testing Div4 Round in Polygon (Codeforces)
Testing Div4-A in Polygon (Codeforces)
Fixing Bad Problem in Polygon (Codeforces)
Codeforces Round 684, no commentary
Codeforces Round 683 (7th place)
Leetcode Biweekly 38 (With Solutions Explained At The End)
Codeforces Round 676 (Div. 2) Screencast & Commentary
(2nd place) Codechef October Cook-off Screencast & Commentary
Codeforces Raif Round 1 Screencast
Codeforces Global Round 11 Screencast
Codeforces Grakn Round Screencast
Codeforces #673 Screencast (6th place)
Codechef Sep Lunchtime Screencast
(Hard) Atcoder Grand Contest 25 Upsolving
Solving Coding Interview Problems: Leetcode, BinarySearch
Codechef September Cook-off Screencast (3rd place)
BinarySearch Weekly Contest 25 Screencast (top3)
JOI Open Contest 2020 (without coding)