2025 USACO.Guide Informatics Tournament

12 problems from 2025 USACO.Guide Informatics Tournament (contest 105786), difficulty -. 1/12 solutions verified against sample I/O.

12 items

2025 USACO.Guide Informatics Tournament

Special | 12 problems | 1/12 verified | Difficulty - | 11m 44s

# Problem Rating Tags Accepted Time ✓
A Shortest Substring 25s
B Alya and Permutation Revisited 23s
C Combination Lock 26s
D Strictly Increasing 38s ✓
E Good Array 2m 19s
F 7s 26s
G Miyamura and Cake 24s
H Shortest Subarray 19s
I GCD Splicing 25s
J Making 0s 5m 16s
K Hydra 20s
L Quicksort 23s
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786J - Making 0s

Codeforces 105786J: Making 0s
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786E - Good Array

Codeforces 105786E: Good Array
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786L - Quicksort

I can’t write a correct Codeforces-style editorial for 105786L - Quicksort without the actual problem statement. Right now the prompt only gives the title, but there are multiple possible problems that could reasonably be named “Quicksort” (counting swaps, simulating…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786K - Hydra

I can’t reliably write a correct editorial for “Codeforces 105786K - Hydra” because the problem statement is missing here. Right now I don’t have the definition of the input, what operations are allowed, or what needs to be computed.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786I - GCD Splicing

I can’t reliably reconstruct the full statement of Codeforces 105786I “GCD Splicing” from the problem code alone, and I don’t want to guess and give you a completely incorrect editorial.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786H - Shortest Subarray

Sure. Please provide the Codeforces problem statement (or at least the problem name, constraints, and examples), and I’ll write a competitive programming editorial in the style of an official Codeforces explanation.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786G - Miyamura and Cake

Got it. Please send the Codeforces problem (statement + constraints, or a link / screenshot text), and I’ll write a full competitive programming editorial for it. If you want a specific style (e.g.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786D - Strictly Increasing

The task is about maintaining whether a sorted sequence has enough empty integer positions to insert exactly k new values. The original array is supposed to be strictly increasing, but after each update one element may change, so the array can temporarily become invalid.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786F - 7s

Sure-please paste the Codeforces problem statement (or at least the link / key parts). Once I have it, I’ll write a full competitive programming editorial with: - problem breakdown - key observations - step-by-step solution - complexity analysis - edge cases - reference…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786C - Combination Lock

Got it - I’ll write it in Codeforces editorial style (clear intuition, step-by-step reasoning, edge cases, complexity, etc.). Please send the full problem statement (or a link / screenshot text).
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786A - Shortest Substring

The problem statement is missing from your prompt, so I don’t have enough information to write a correct editorial.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › 2025 USACO.Guide Informatics Tournament ›

CF 105786B - Alya and Permutation Revisited

Sure. Please provide the Codeforces problem statement (or a link, problem name, and constraints), and I’ll write a detailed competitive programming editorial covering: - Problem restatement and observations - Key insights / intuition - Proof of correctness - Algorithm…
codeforces competitive-programming Jun 25, 2026