April Fools Day Contest 2024

Solutions for April Fools Day Contest 2024 (contest 1952). 5/8 problems verified against sample I/O. Difficulty range: -.

8 items

April Fools Day Contest 2024

Type: April Fools | Problems: 8 | Verified: 5/8 | Rating range: - | Time: 7m 9s

Problem	Name	Rating	Tags	Solve Time	Verified
A	Are You a Robot, Again?	-	*special, strings	32s	✓
B	Is it stated?	-	*special, strings	41s	✓
C	They Have Fooled	-	*special, brute-force, schedules	52s	✓
F	Grid	-	*special, brute-force	1m 12s	✗
G	Mathematician Takeover	-	*special, binary-search, dfs-and-similar	1m 8s	✗
H	Palindrome	-	*special, implementation, strings	1m 12s	✗
I	Dark Matter	-	*special, bitmasks, geometry	48s	✓
J	[Help, what does it mean to be ](https://codeforces.com/problemset/problem/1952/J)	-	*special, brute-force, constructive-algorithms	44s	✓

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CF 1952A - Are You a Robot, Again?

In this problem, we are given a string of digits that a robot has produced. The robot operates under a simple but peculiar rule: for each digit in the string, if the digit is even, it will remain in the output string as-is.

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CF 1952B - Is it stated?

We are given a list of strings, each consisting of lowercase English letters, and for each string, we are asked to answer either "YES" or "NO" based on a hidden pattern.

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CF 1952C - They Have Fooled

The input to this problem is a single integer $n$, with $0 le n le 12$. Despite how small this looks, the task is not about iterating or simulating anything directly from this number in a naive arithmetic sense.

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CF 1952F - Grid

We are given a fixed-size grid of 21 rows and 21 columns. Each cell contains either 0 or 1. The grid should be viewed as a map where each cell is a square tile, and tiles with the same value may form connected regions through shared edges.

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CF 1952G - Mathematician Takeover

We are given a single real number $x$ between 1 and 100, expressed to exactly three decimal places. The task is to compute a real number result from $x$, with the requirement that the answer's absolute or relative error does not exceed $10^{-4}$.

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CF 1952H - Palindrome

The task is to determine, for each given string, whether it reads the same forwards and backwards. A palindrome is such a string, like "radar" or "racecar", while a string like "ac" is not.

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CF 1952I - Dark Matter

The input describes a single arithmetic-style expression consisting of integers combined with the + operator. The key difference from standard arithmetic is that + does not mean numeric addition.