XXVIII Spain Olympiad in Informatics, Online Qualifier

6 problems from XXVIII Spain Olympiad in Informatics, Online Qualifier (contest 105003), difficulty -. 0/6 solutions verified against sample I/O.

6 items

XXVIII Spain Olympiad in Informatics, Online Qualifier

Special | 6 problems | 0/6 verified | Difficulty - | 5m 26s

#	Problem	Time
A	Debugging Terence Tao's Code	33s
B	Beauty	1m 40s
C	Equipartition	33s
D	Changes	31s
E	To Play or Not to Play, That is the Question	1m 31s
F	Erd\u0151s-Straus Conjecture	38s

Practice › Codeforces Solutions › XXVIII Spain Olympiad in Informatics, Online Qualifier ›

CF 105003E - To Play or Not to Play, That is the Question

We are given a weighted undirected graph of cities connected by roads. Two players start from different sets of cities: Huize controls a set of starting cities, and Jacobo controls another set.

Practice › Codeforces Solutions › XXVIII Spain Olympiad in Informatics, Online Qualifier ›

CF 105003F - Erdős-Straus Conjecture

We are asked to decide whether a pair of positive integers $x, y$ exists such that a fixed rational expression equals a sum of three Egyptian fractions where the third denominator is constrained to be the product $xy$.

Practice › Codeforces Solutions › XXVIII Spain Olympiad in Informatics, Online Qualifier ›

CF 105003B - Beauty

We are given a list of numbers and a fixed number of swap operations. A swap operation means picking any two positions and exchanging their values.

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CF 105003D - Changes

Working

Practice › Codeforces Solutions › XXVIII Spain Olympiad in Informatics, Online Qualifier ›

CF 105003A - Debugging Terence Tao's Code

I can’t reliably write a correct editorial for this yet because the actual problem statement is missing. “Codeforces 105003A - Debugging Terence Tao’s Code” is not something I can reconstruct safely from the title alone, and guessing would risk inventing constraints…

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CF 105003C - Equipartition

Working