第一次看此系列文的朋友，請先移步到 Day 1 – 如何開始？進行方式、自我介紹實戰 哦！

🎬 情境故事

技術面試時，考官在白板上寫了一題演算法題目，要你邊思考邊解釋過程。我會卡在「不知道怎麼開頭」、「解釋思路不夠有條理」，或者一緊張就只想寫程式碼，卻忽略了英文口說的邏輯表達。只會說「This is ...」、「If ... then do ...」。

今天的目標：選一個簡單的演算法題，不寫程式碼，只專注在「口頭解釋邏輯」。

🤖 Config Prompt

[Config]
- Day: Day3 – Whiteboard Problem Explanation
- Scenario: Job interview — explaining a whiteboard coding problem in English. The whiteboard coding problem is 'Contains Duplicate' from LeetCode.

👉 在練習之前...

先閱讀一下 Config 中提供的演算法題「Contains Duplicate」，並思考一下你會怎麼解。

然後按照這個步驟，想一下：

1. 問題是什麼
2. 使用什麼資料結構
3. 程式流程
4. 時間複雜度、空間複雜度

並且把關鍵字寫下來。

我的關鍵字：

1. distinct element
2. hashmap
3. check if each element is in hashmap or not. store the element into hashmap.
4. time: bigO(N), space: bigO(N)

🎯 開始進行練習

記得把對話錄下來，自己聽一次，想想有哪裡不自然。

📌 小技巧

可以不用一次說完，一個步驟一個步驟說。也可以 Follow GPT 的引導。

🆘 今日救命句

• 救命句（簡短切入）：

  Let me walk you through my thought process.

• 爭取思考時間：

  Give me a moment to think about it.

🔑 核心句型

1. 開始解題思路

   • First, I want to clarify the problem.
   • I will start by identifying the inputs and outputs.

2. 解釋邏輯流程

   • I will try a simple solution first, then optimize.
   • We can break the problem into smaller steps.

3. 說明邊界條件／效能

   • We should also consider edge cases such as…
   • This solution works, but the time complexity is O(n²).

4. 收尾與總結

   • To summarize, my solution is…
   • The key idea here is…

5. 描述程式結構 / 寫程式過程

   • I will start with a function called …
   • I declare a variable to store …
   • This loop goes through each element in the array.

6. 說明條件判斷

   • If the value matches the condition, then we …
   • Otherwise, the program will …
   • This check ensures that invalid input is handled.

7. 解釋程式碼的作用

   • This line initializes the data structure.
   • This part updates the result after each iteration.
   • This function helps us to reuse the logic.

8. 描述測資 / 執行流程

   • For example, if the input is [2, 3, 5], the output will be …
   • Let’s walk through the code with a sample input.
   • Step by step, the function produces the correct result.

📝 我的今日反饋

今天在練習之前，有一場跟 CEO 的 Behavior Interview。

結果一跟外國人講話就又原形畢露了，完全沒在管文法。但是後續有發現我太急著要說了，所以有刻意慢下來，一個字一個字說清楚。

今天的練習就很仔細把我想講的先想清楚再慢慢說。

然後我發現使用「If ....」就很好用了，不用特別去說「When」或是其他狀況用詞。

1.	Per-turn Corrections:
	•	Turn 3: You said “if there is any element appear before.”
	•	Rewrite: “If there is any element that appears before.”
	•	Alternative: “If we see a repeated element, we return true.”
	2.	Top 3 Patterns:
	•	Sometimes missing the “s” for plurals. Just remember to add “s” for plural words.
	•	Tending to say “duplicated” instead of “duplicate.” Keep it simple with “duplicate.”
	•	Sometimes leaving out little words like “that.” Remember: “an element that appears.”
	3.	Phrase Pack:
	•	“We’ll use a hash map to store elements.”
	•	“If we find a duplicate, we return true.”
	•	“If there are no duplicates, we return false.”
	•	“We just iterate through the array.”
	•	“This is how we solve the problem.”
	4.	Intonation Tip:
	•	Try stressing the word “if” at the start of a condition. For example: “IF we find a duplicate, we return true.” This makes your conditions clearer.
	5.	Fluency & Pronunciation Notes:
	•	You spoke at a nice, steady pace.
	•	Your pronunciation of technical terms was clear.
	•	Just remember those small plural endings.
	•	Great job keeping your sentences short and clear.
	•	Overall, you sounded confident by the end.
	6.	Key Focus for Next Time:
	•	Let’s focus on consistent plurals.
	•	Practice a bit more on using “if” clauses confidently.
	•	For a quick drill: Spend two minutes shadowing these corrected sentences and one minute doing a summary of the solution in your own words.