OCPC 2024 Summer, Day 4: wuhudsm Contest

13 problems from OCPC 2024 Summer, Day 4: wuhudsm Contest (contest 106298), difficulty -. 10/13 solutions verified against sample I/O.

13 items

OCPC 2024 Summer, Day 4: wuhudsm Contest

Special | 13 problems | 10/13 verified | Difficulty - | 12m 15s

#	Problem	Time	✓
A	Explosive String	29s
B	Doors	51s	✓
C	Minimum Inversions	54s	✓
D	Breezy GCD Problem	48s	✓
E	Manhattan Tree	53s	✓
F	Cool Operations	52s	✓
G	Yet Yet Another Binary String Problem	54s	✓
H	Xor and Permutation	28s
I	Mega Polynomial	53s	✓
J	Equal Node Sum	1m 7s	✓
K	Mad MAD Sum III	53s	✓
L	Enigmatic Game	2m 17s
M	Closed Paths	56s	✓

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298A - Explosive String

The statement as provided is incomplete in a way that makes the actual task undefined. All we know is that the input contains a string with characters from {L, R, ?} and that we are allowed to replace every ‘?’ either with ‘L’ or with ‘R’.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298J - Equal Node Sum

We are working with a tree structure where each node can contribute some value, and these contributions interact locally along edges.

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CF 106298G - Yet Yet Another Binary String Problem

We are working with binary strings where the important structure is not individual characters but contiguous segments of equal characters. Each maximal segment of consecutive 0s or consecutive 1s forms a block.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298L - Enigmatic Game

Thinking

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298D - Breezy GCD Problem

We are given a collection of integer intervals. Each interval represents a range of allowed values, and we are trying to determine whether there exists a single integer that behaves consistently across all intervals under a GCD-like constraint.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298M - Closed Paths

We are working on a rooted tree where every node can be affected by updates that do not follow a single simple pattern like “subtree only” or “path only”.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298K - Mad MAD Sum III

We are asked to construct an array of length $n$ containing integers in a bounded range such that a global score computed over all subarrays equals a given target $m$.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298I - Mega Polynomial

We are given a collection of integers that define a rational expression built from falling factorials. The central object is a constant $K$ defined indirectly through two equivalent coefficient comparisons in a polynomial identity.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298H - Xor and Permutation

The problem statement is missing from your prompt, so I can’t safely reconstruct the intended solution. “Xor and Permutation” could refer to several different CF-style tasks (constructing a permutation under XOR constraints, counting pairs, XOR basis over permutations, etc.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298F - Cool Operations

We are given a static array and then multiple queries. Each query describes a segment of the array and asks us to compute a value derived from that segment using a combination of prefix contributions and a single best “transition” choice.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298E - Manhattan Tree

We are given a tree, meaning a connected graph with no cycles, and we want to decide whether it can be considered a “Manhattan Tree”.

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298C - Minimum Inversions

We are given a set of elements indexed from 1 to n. For each element i, two independent values are already known: one value represents the number of inversions contributed by i if it is placed into a construction on the left side, and the other represents the number of…

Practice › Codeforces Solutions › OCPC 2024 Summer, Day 4: wuhudsm Contest ›

CF 106298B - Doors

We are given a sequence of doors arranged in a line. Each door has a number associated with it that can be interpreted as the “strength” or “cost” of that door. You start before the first door and try to move forward as far as possible.