UTPC April Fools Contest 2026

13 problems from UTPC April Fools Contest 2026 (contest 106452), difficulty -. 4/13 solutions verified against sample I/O.

13 items

UTPC April Fools Contest 2026

April Fools | 13 problems | 4/13 verified | Difficulty - | 11m 14s

# Problem Rating Tags Accepted Time ✓
A Captcha 5m 19s
B Right or Wrong? 25s
C New Sorting Algorithm 25s
D Subset Sums 45s
E Gemini 22s
F Something's Fishy 18s
G Forgot where I took this pic 49s ✓
H Fill in the Blanks 47s ✓
I Networking Problem 21s
J Guess the Number! 32s ✓
K Guessing Game 19s
L MST 32s ✓
M META 20s
Practice › Codeforces Solutions › UTPC April Fools Contest 2026 ›

CF 106452A - Captcha

Codeforces 106452A: Captcha
codeforces competitive-programming Jun 25, 2026
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CF 106452L - MST

We have a connected weighted undirected graph. An MST is a spanning tree with the smallest possible total edge weight, but several different trees can have the same minimum cost.
codeforces competitive-programming Jun 25, 2026
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CF 106452M - META

I can write the full Codeforces-style editorial, but I need the actual problem statement for Codeforces 106452M - META. Right now I only have the contest ID and name, and that’s not enough to reliably reconstruct the task.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › UTPC April Fools Contest 2026 ›

CF 106452K - Guessing Game

Sure - I can write a full Codeforces-style editorial, but I’ll need the problem first. Please paste one of the following: - the full problem statement, or - at least the key parts (input/output + constraints + description), or - the Codeforces link Once I have it, I’ll…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › UTPC April Fools Contest 2026 ›

CF 106452J - Guess the Number!

The hidden value is a single integer chosen somewhere between 1 and 1,000,000. The program is allowed to communicate with the judge by asking questions of the form “is the hidden number at least k?”. The judge replies with 1 when the condition is true and 0 otherwise.
codeforces competitive-programming Jun 25, 2026
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CF 106452I - Networking Problem

I can’t write a correct editorial for this yet because the actual problem statement is missing from your prompt.
codeforces competitive-programming Jun 25, 2026
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CF 106452H - Fill in the Blanks

The problem hides a simple base-conversion task behind the notation. The given value is written using some base i, and the goal is to print the same number written using another base j. The confusing part is the notation ai.
codeforces competitive-programming Jun 25, 2026
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CF 106452G - Forgot where I took this pic

We are given a multiset of integers whose size is even. These numbers represent coordinates, but the pairing structure has been lost. Originally, each pair of numbers formed a 2D point, meaning every point consists of exactly two values taken from this pool of numbers.
codeforces competitive-programming Jun 25, 2026
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CF 106452D - Subset Sums

I cannot write a correct editorial and accepted Python solution for this problem as stated, because the constraints make the problem a general counting subset sum problem, which does not have a known polynomial-time solution.
codeforces competitive-programming Jun 25, 2026
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CF 106452F - Something's Fishy

I can’t reliably write a correct Codeforces-style editorial without the actual problem statement. “Codeforces 106452F - Something’s Fishy” isn’t enough to reconstruct the task, and guessing would risk inventing constraints, operations, or even the intended algorithm…
codeforces competitive-programming Jun 25, 2026
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CF 106452E - Gemini

I can’t write a correct editorial for “Codeforces 106452E - Gemini” as-is because the problem statement is missing from your prompt.
codeforces competitive-programming Jun 25, 2026
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CF 106452B - Right or Wrong?

Got it - I can write a full Codeforces-style editorial (intuition, observations, proofs, implementation details, complexity, edge cases, etc.).
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › UTPC April Fools Contest 2026 ›

CF 106452C - New Sorting Algorithm

I can write the full editorial in that format, but I need the actual problem statement first. I could not identify Codeforces 106452C - New Sorting Algorithm from the problem ID alone, and the prompt’s “Problem Statement / Input / Output” sections are empty.
codeforces competitive-programming Jun 25, 2026