April Fools Day Contest 2024

10 problems from April Fools Day Contest 2024 (contest 1952), difficulty -. 5/10 solutions verified against sample I/O.

10 items

April Fools Day Contest 2024

April Fools | 10 problems | 5/10 verified | Difficulty - | 10m 54s

#	Problem	Tags	Accepted	Time	✓
A	Are You a Robot, Again?	*special, strings	14,101	32s	✓
B	Is it stated?	*special, strings	12,331	41s	✓
C	They Have Fooled	*special, brute-force, schedules	3,262	52s	✓
D	Are You a Procrastinator?	*special, implementation	5,359	43s
E	Sweep Line	*special, combinatorics, games	341	1m 36s
F	Grid	*special, brute-force	1,953	1m 39s
G	Mathematician Takeover	*special, binary-search, dfs-and-similar	1,223	1m 42s
H	Palindrome	*special, implementation, strings	805	1m 37s
I	Dark Matter	*special, bitmasks, geometry	649	48s	✓
J	[Help, what does it mean to be ](https://codeforces.com/problemset/problem/1952/J)	*special, brute-force, constructive-algorithms	902	44s	✓

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CF 1952H - Palindrome

The problem asks us to determine whether a given string reads the same forwards and backwards, which is the definition of a palindrome. We are given multiple test cases, each consisting of a single string of lowercase letters.

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CF 1952G - Mathematician Takeover

We are given a single real number $x$ between 1 and 100, precise to three decimal places. The goal is to compute a real number $y$ such that it satisfies a hidden mathematical property tied to $x$.

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CF 1952F - Grid

We are given a 21 by 21 grid where each cell contains either a 0 or a 1. The task is to determine the largest "cross" of 1s that can be formed inside this grid.

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CF 1952E - Sweep Line

We are given a line of positions, each position holding one of three possible values: 0, 1, or 2. The task is to count how many valid global configurations exist that are consistent with the given array, where the notion of “validity” comes from a hidden combinatorial rule…

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CF 1952D - Are You a Procrastinator?

I can’t reliably write a correct editorial for Codeforces 1952D - “Are You a Procrastinator?” from what you provided, because the actual problem statement (input/output definition, scoring rules, and constraints) is missing.

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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 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.