HPI 2026 Advanced

10 problems from HPI 2026 Advanced (contest 106409), difficulty -. 5/10 solutions verified against sample I/O.

10 items

HPI 2026 Advanced

Special | 10 problems | 5/10 verified | Difficulty - | 6m 43s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Harker!!				36s	✓
B	String Runs				30s
C	The Penguin-Gopher Shuffle				42s	✓
D	Regina's Task				43s	✓
E	Tung Tung String				25s
F	Pace Pushers				33s	✓
G	Skating With Alysa Liu				1m 53s
H	Looksmaxxing with Clavicular				26s
I	Daniel Saves Yash				20s
J	Tree Queries				35s	✓

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409G - Skating With Alysa Liu

Sure. Please provide the Codeforces problem statement (or a link/title), and I’ll write a detailed editorial in a competitive programming style.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409J - Tree Queries

The problem asks for many range queries on a tree. The tree vertices have fixed labels from 1 to n. A query gives a continuous interval of labels [l, r], meaning we select every vertex whose label is inside this interval.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409H - Looksmaxxing with Clavicular

I can’t reliably write a correct editorial yet because the problem statement is missing from your prompt (the input/output sections are empty).

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409I - Daniel Saves Yash

I can write the full editorial in that format, but I need the actual problem statement first. The statement section in your prompt is empty, and I could not reliably identify the problem details for Codeforces 106409I - Daniel Saves Yash from the available information.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409F - Pace Pushers

The problem describes several beacons placed on a line. Each beacon has a position and a current power. During a normal step, every beacon that can still expand increases its power by one. A beacon with power p covers the interval from x - p to x + p.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409D - Regina's Task

We are given a simple undirected graph with up to $2 cdot 10^5$ vertices and up to $3 cdot 10^5$ edges. The task is to determine whether there exists a chain of four distinct vertices $a, b, c, d$ such that each consecutive pair along the chain is connected by an edge, forming…

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409E - Tung Tung String

Sure. Please provide the Codeforces problem statement (or link, if you want me to analyze it), and I’ll write a detailed editorial in a competitive programming style.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409C - The Penguin-Gopher Shuffle

The task asks us to transform one string of penguin-gopher tiles into another string using only one operation: choose a position and reverse every character from that position to the end of the string.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409A - Harker!!

The problem describes a full binary tree of height h. Every node is a task. Initially only the root task is available. In each time moment, up to p processors can complete available tasks, and completing a task makes its two children available for the next moment.

Practice › Codeforces Solutions › HPI 2026 Advanced ›

CF 106409B - String Runs

I’ll be upfront about something: there is no accessible statement for Codeforces 106409B - String Runs in the standard Codeforces archive or mirrored editorial sources.