Insomnia-26

15 problems from Insomnia-26 (contest 106439), difficulty -. 5/15 solutions verified against sample I/O.

15 items

Insomnia-26

Special | 15 problems | 5/15 verified | Difficulty - | 12m 42s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Ancient Trees				25s
B	Bog the Frog				24s
C	Crushing the Array				29s	✓
D	The Disastrous Mex Problem for Saiki K				23s
E	Echoing Remainder				34s	✓
F	The Forgotten Player				5m 21s
G	Another GCD Game				35s
H	Shelter in the Rain				35s	✓
I	Random Tree Leaves				22s
J	Jaded Jeweler's Journey				1m 9s
K	Mood Swings				21s
L	Leylines of Lumina				21s
M	ModulOR Equation				41s	✓
N	Chapo Nahi Mili				18s
O	Optimal GCD Split				44s	✓

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439F - The Forgotten Player

Codeforces 106439F: The Forgotten Player

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439O - Optimal GCD Split

We are given an array of positive integers. A split position divides it into a left part and a right part. A split is considered good if we can make the greatest common divisor of the two parts equal after changing at most one array element.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439M - ModulOR Equation

We are asked to count ordered pairs $(a, b)$ inside a rectangle of integers, where $a$ ranges from $1$ to $n$ and $b$ ranges from $1$ to $m$, that satisfy a very specific algebraic condition mixing modular arithmetic and bitwise operations.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439N - Chapo Nahi Mili

I can write the full editorial in that format, but I do not have enough information about the problem itself. The statement section in your prompt is empty, and I could not reliably identify the problem from only “Codeforces 106439N - Chapo Nahi Mili”.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439J - Jaded Jeweler's Journey

I can write the editorial, but the full version requested is longer than the maximum response size I can fit in one message. I’ll provide it in parts so that every required section, including the complete Python solution and tests, can be included without truncation.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439L - Leylines of Lumina

I can write the full Codeforces-style editorial in the exact format you requested, but I’m missing the actual problem statement. Right now the prompt only includes the title (“Leylines of Lumina”) and metadata, but no description of what the input/output or rules are.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439K - Mood Swings

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 106439K - Mood Swings isn’t included, and I don’t have enough reliable information to reconstruct it.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439I - Random Tree Leaves

I can’t reliably write a correct editorial for this yet because the actual problem statement is missing from your message.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439H - Shelter in the Rain

The problem describes a journey through a weighted undirected graph. Vertices are locations, edges are roads, and every road has a travel time. You begin at one location and want to reach another one. Some locations have shelters.

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CF 106439G - Another GCD Game

Something went wrong while generating the response. If this issue persists please contact us through our help center at [help.openai.com](https://help.openai.com/).

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439E - Echoing Remainder

The task is to build a positive integer array of length n that satisfies a local rule between every neighboring pair. For each position i, the value at i must leave remainder exactly 1 when divided by the next value.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439D - The Disastrous Mex Problem for Saiki K

I don’t have the actual statement of Codeforces 106439D (“The Disastrous Mex Problem for Saiki K”) in this context, and I can’t reliably reconstruct it from the title alone without risking inventing details.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439C - Crushing the Array

The game is played on an array of integers. A valid move removes one entire block of equal values. A block means a maximal consecutive group where every element is the same, so the player cannot remove a part of a block.

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CF 106439A - Ancient Trees

I can write the full editorial, but the actual problem statement for Codeforces 106439A - Ancient Trees is missing from your prompt.

Practice › Codeforces Solutions › Insomnia-26 ›

CF 106439B - Bog the Frog

I can’t write a correct editorial for Codeforces 106439B - Bog the Frog without the actual problem statement. This is especially important because Codeforces “Bog the Frog” variants differ a lot across contests, and the solution structure (DP, graph traversal, greedy…