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schemaReusable solving pattern

string plus string matching Pattern

Pattern hubs are for building transferable solving frames. Learn the recognition signals first, then drill state definition, update rules, and edge explanation until the pattern feels stable.

database5 problemstune3/1/1 difficulty mixcategory2 linked topics

Pattern brief

Recognize first

The candidate is able to identify the pattern and suggest multiple methods for solving it.

Solve rhythm

State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.

Most common miss

The candidate might suggest overly complicated solutions when a simpler method, such as string concatenation, suffices.

Recognition signals

  • The candidate is able to identify the pattern and suggest multiple methods for solving it.
  • The candidate considers both the time and space complexity in their solution approach.
  • Ability to handle string manipulations and substring matching efficiently.

Solve flow

  1. 1. Define the active state/window.
  2. 2. Update state while preserving invariants.
  3. 3. Validate with edge-heavy examples.

Common misses

  • The candidate might suggest overly complicated solutions when a simpler method, such as string concatenation, suffices.
  • Not considering edge cases where b might be smaller than a or when it might take multiple repetitions to match.
  • Simulating each rotation with loops instead of concatenation causes unnecessary O(n^2) time.

Recommended Ladder

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Problem bank

string plus string matching pattern bank

Start by scanning with search or difficulty filters, then narrow by linked topics. The bank continues loading inside its own container so the page stays readable.

Progressive pattern bank

Use it to build pattern understanding first, then expand into the full corpus.

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Showing 5 / 5 problems

#TitleDifficulty
459

Repeated Substring Pattern

Check if a string can be constructed by repeating a substring using string matching techniques.

Easy
686

Repeated String Match

Find the minimum number of repetitions of string a to make string b a substring of the repeated string a.

Medium
796

Rotate String

Determine if one string can be rotated into another by repeatedly shifting characters, leveraging string matching techni…

Easy
3303

Find the Occurrence of First Almost Equal Substring

Locate the first substring in s that is almost equal to pattern by allowing at most one character mismatch efficiently.

Hard
3407

Substring Matching Pattern

Determine if a pattern containing a single wildcard can match any substring of a given string efficiently.

Easy

Continue by topic

Once the pattern itself feels familiar, move back into concrete topic hubs so you can separate the pattern from the changing problem context.

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String plus String Matching LeetCode Pattern: 5 Solutions