Educational Codeforces Round 45 (Rated for Div. 2)

3 problems from Educational Codeforces Round 45 (Rated for Div. 2) (contest 990), difficulty 1000-2100. 1/3 solutions verified against sample I/O.

3 items

Educational Codeforces Round 45 (Rated for Div. 2)

Div. 2 | 3 problems | 1/3 verified | Difficulty 1000-2100 | 4m 49s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Commentary Boxes	1000	implementation, math	11,209	1m 26s	✓
C	Bracket Sequences Concatenation Problem	1500	implementation	6,293	1m 36s
E	Post Lamps	2100	brute-force, greedy	2,163	1m 47s

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CF 990C - Bracket Sequences Concatenation Problem

We are given a collection of strings, each consisting only of opening and closing parentheses. Think of each string as a small “building block” of a larger bracket expression.

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CF 990E - Post Lamps

We are placing lamps along a one-dimensional street that runs from position 0 up to position n. Some positions are forbidden, meaning we are not allowed to place a lamp there, but otherwise we may choose any allowed position as a base.

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CF 990A - Commentary Boxes

We are given an initial number of commentary boxes and a required number of delegations. Every delegation must receive exactly the same number of boxes, and all existing boxes must be used so that nothing remains idle.