2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN

13 problems from 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN (contest 106062), difficulty -. 5/13 solutions verified against sample I/O.

13 items

2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN

Special | 13 problems | 5/13 verified | Difficulty - | 6m 52s

# Problem Rating Tags Accepted Time ✓
A A Non-Prime Number 49s ✓
B Beautiful Trees 41s ✓
C Chained Training 42s ✓
D Drone Kaleidoscope 24s
E Esoteric Computer Architecture 2 26s
F Fifth Commandment 26s
G Galactic Reassigment 37s ✓
H Hive Revenge 30s
I In Search of Soles 29s
J Just an integer 39s ✓
K Kadane's Algorithm? 26s
L Leo's Daily Training (2025 version) 23s
M Matrix operations 20s
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062M - Matrix operations

I can’t reliably write a correct editorial for “Codeforces 106062M - Matrix operations” without the actual problem statement.
codeforces competitive-programming Jun 25, 2026
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CF 106062J - Just an integer

We are given a directed graph whose vertices are the integers from 1 to n. From every number u, we draw edges to all its proper divisors, meaning every v such that v divides u and v is strictly smaller than u.
codeforces competitive-programming Jun 25, 2026
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CF 106062K - Kadane's Algorithm?

Sure. Please provide the Codeforces problem statement (or a link, title, and constraints), and I’ll write a detailed competitive programming editorial covering: - Problem restatement and key observations - Derivation of the main idea - Why naive approaches fail - Algorithm /…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062L - Leo's Daily Training (2025 version)

We are missing the actual statement text for Codeforces 106062L, and it is not reliably retrievable from the contest metadata alone.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062I - In Search of Soles

I can’t reliably write a correct editorial for this problem as-is because the actual problem statement (inputs, outputs, and rules of “In Search of Soles”) is missing.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062G - Galactic Reassigment

We have a rooted tree of planets. Planet 1 is the root, and every other planet stores the index of its current direct supervisor.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062H - Hive Revenge

The problem statement is missing from your prompt, so there isn’t enough information to reconstruct the task or derive a correct solution.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062F - Fifth Commandment

I’m missing the actual content of the problem statement here. What you pasted is only the Codeforces title and contest metadata; the real statement (the geometric / graph / combinatorics description, constraints, and samples) is not included.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062E - Esoteric Computer Architecture 2

The problem statement section is empty, so I don’t have the actual rules of the “Esoteric Computer Architecture 2” system to reason about.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062D - Drone Kaleidoscope

Sure. Send me the Codeforces problem statement (and constraints, examples if available), and I’ll write a detailed competitive programming editorial covering: - Problem restatement / intuition - Key observations - Derivation of the algorithm - Proof of correctness -…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062A - A Non-Prime Number

The task is centered around deciding whether a given integer behaves like a prime or not, and responding accordingly for each query.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062C - Chained Training

We are given a sequence of entities, each described by three numbers that behave like parameters of a training profile.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 XVII Donald Knuth Annual Programming Contest by ESCOM-IPN ›

CF 106062B - Beautiful Trees

The task gives a rooted tree with node 1 as the root. We have to assign every node a different number from 1 to n. The assignment is valid only if all given conditions about paths are satisfied.
codeforces competitive-programming Jun 25, 2026