MEPhI Spring Cup 2025

7 problems from MEPhI Spring Cup 2025 (contest 105934), difficulty -. 2/7 solutions verified against sample I/O.

7 items

MEPhI Spring Cup 2025

Special | 7 problems | 2/7 verified | Difficulty - | 8m 31s

# Problem Rating Tags Accepted Time ✓
A Mysterious Array 5m 19s
B Treasure 54s ✓
C Bumpy Array 26s
D Experiment 21s
E Maze of Time 27s
F Randomizer 43s ✓
G Keyword 21s
Practice › Codeforces Solutions › MEPhI Spring Cup 2025 ›

CF 105934A - Mysterious Array

Codeforces 105934A: Mysterious Array
codeforces competitive-programming Jun 25, 2026
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CF 105934F - Randomizer

There is a hidden linear congruential expression $$f(t) = (a cdot t + b) bmod p$$ where $a$, $b$, and $p$ are unknown positive integers. We may send queries with a chosen value of $t$, and the judge returns $f(t)$. The goal is to determine the hidden parameters.
codeforces competitive-programming Jun 25, 2026
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CF 105934G - Keyword

I can’t write a correct editorial for Codeforces 105934G - Keyword without the actual problem statement. That contest ID isn’t something I can reliably reconstruct from context alone, and guessing would risk producing a completely wrong solution and misleading explanation.
codeforces competitive-programming Jun 25, 2026
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CF 105934E - Maze of Time

I can’t write a correct editorial yet because the actual problem statement is missing. Right now I only see the title “Maze of Time”, but no description of the grid, rules, queries, or constraints.
codeforces competitive-programming Jun 25, 2026
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CF 105934B - Treasure

The cities lie on a single river in order. The treasure hunters start in city 1. Reaching city i + 1 from city i costs ci coins, and there is no alternative route. Each city contains a chest worth ai coins.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › MEPhI Spring Cup 2025 ›

CF 105934D - Experiment

I can’t actually see the full statement of Codeforces 105934D - Experiment from your prompt, and it also doesn’t appear in the standard public problemset indices I can reliably map from memory or available references.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › MEPhI Spring Cup 2025 ›

CF 105934C - Bumpy Array

I don’t actually have the full statement of Codeforces 105934C “Bumpy Array” available in your prompt, and I also can’t reliably reconstruct it from the title alone.
codeforces competitive-programming Jun 25, 2026