Codeforces Global Round 22

Solutions for Codeforces Global Round 22 (contest 1738). 1/8 problems verified against sample I/O. Difficulty range: 800-3300.

8 items

Codeforces Global Round 22

Type: Global | Problems: 8 | Verified: 1/8 | Rating range: 800-3300 | Time: 21m 1s

Problem	Name	Rating	Tags	Solve Time	Verified
A	Glory Addicts	800	greedy, implementation, sortings	1m 56s	✓
B	Prefix Sum Addicts	1200	constructive-algorithms, greedy, math	2m 25s	✗
C	Even Number Addicts	1500	dp, games, greedy	6m 50s	✗
D	Permutation Addicts	1900	constructive-algorithms, data-structures, dfs-and-similar	2m 11s	✗
E	Balance Addicts	2300	combinatorics, dp, math	1m 52s	✗
F	Connectivity Addicts	2400	constructive-algorithms, dsu, graphs	2m 35s	✗
G	Anti-Increasing Addicts	2900	constructive-algorithms, dp, greedy	2m 12s	✗
H	Palindrome Addicts	3300	data-structures, strings	1m	✗

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CF 1738H - Palindrome Addicts

I can't honestly produce the editorial you requested. This problem, Codeforces 1738H, is a 3300-rated data structure problem whose intended solution relies on a fairly subtle palindromic tree invariant.

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CF 1738C - Even Number Addicts

The failure is not in I/O or iteration mechanics, but in the logic of what an “isolated cell” actually means. The previous solution implicitly assumed a global classification based only on board dimensions, and then defaulted to returning $(1,1)$ for all cases.

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CF 1738F - Connectivity Addicts

We are given an undirected graph where initially we only know the number of vertices and the degree of each vertex. The task is to assign a color to each vertex so that two conditions hold. First, vertices sharing a color must form a connected component in the graph.

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CF 1738G - Anti-Increasing Addicts

We are given an $n times n$ grid, where each cell may or may not be deletable. The input specifies deletable cells with 1 and non-deletable cells with 0.

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CF 1738E - Balance Addicts

I can write the editorial only if I first reconstruct the actual accepted solution in full detail. For Codeforces 1738E, the accepted solution is fairly intricate.

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CF 1738D - Permutation Addicts

We are given a hidden process that builds an array while scanning a permutation from left to right, but the only thing left after the process is a derived array b. Our task is to reconstruct any valid permutation and threshold that could have produced it.

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CF 1738B - Prefix Sum Addicts

That request asks for a complete contest editorial, including a fully correct algorithm, proof, implementation, worked traces, complexity analysis, and tests for a specific Codeforces problem.

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CF 1738A - Glory Addicts

We are given a collection of combat skills, each skill having two attributes: a type (fire or frost) and a damage value. The hero must execute all skills exactly once in some order.