docs(readme): clarify problem solving approach for frequency related problems

README.md

@@ -16,61 +16,3 @@ Relevant problems for myself
 - ♿ Patterns
 
 
-## The Golden Rule (Memorize This)
-
-**Only sort if the problem asks for ORDER or RANKING.**
-
-If the problem asks for:
-- "first"
-- "index"
-- "position"
-- "does it exist"
-- "true/false"
-- "count how many"
-
-→ **DO NOT SORT**. Just use the frequency map and loop.
-
----
-
-## Decision Cheat Sheet
-
-| What the problem wants                  | Do you need to sort? | What to do instead                  | Example Problem     |
-|-----------------------------------------|----------------------|-------------------------------------|---------------------|
-| Sort characters by how often they appear | YES                 | Freq + Sort                         | LC 451             |
-| Top K most frequent                     | YES                 | Freq + Sort + slice                 | LC 347             |
-| Sort array by frequency                 | YES                 | Freq + Sort                         | LC 1636            |
-| First unique character (index)          | NO                  | Freq + loop original string         | LC 387             |
-| Is it an anagram?                       | NO                  | Freq + check counts                 | LC 242             |
-| How many numbers smaller than current   | Kind of             | Freq + prefix count                 | LC 1365            |
-| Most frequent element                   | NO                  | Freq + find max                     | LC 169             |
-
----
-
-## Mental Checklist (Say this out loud every time)
-
-1. "Did I count the frequencies?" → Yes
-2. "Does the problem care about the **original order**?"  
-   - Yes → Loop the original string/array and check freq
-   - No  → You can sort
-3. "Does it want an **index** or a **boolean**?"  
-   - Yes → Almost never sort
-4. "Does it want the elements **re-ordered**?"  
-   - Yes → Sort by frequency
-
----
-
-## Super Short Version to Tattoo in Your Brain
-
-**"If it wants the first / index / true-false → loop original.  
-If it wants sorted / top k / reordered → sort."**
-
----
-
-## Practice Trigger Words
-
-- "first non-repeating" → Loop original
-- "return its index" → Loop original  
-- "sort by frequency" → Sort
-- "top k frequent" → Sort + slice
-- "valid anagram" → Just check counts
-