chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/algorithms-in-code/binary-search-in-code-video.md

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+---
+id: 698dcc2c7932b3cc4b19c927
+title: Binary Search in Code
+challengeType: 11
+videoId: mg7F5D8Wk5o
+dashedName: binary-search-in-code
+---
+
+# --description--
+
+In this video, you will code out the binary search algorithm using Python.
+
+# --questions--
+
+## --text--
+
+Why was the `while first <= last:` condition used in the solution?
+
+## --answers--
+
+To ensure only the first half of the array is ever checked.
+
+---
+
+To make the loop run forever until manually stopped.
+
+---
+
+To skip checking the last element in the search range.
+
+---
+
+To keep searching while there are still elements in the range and stop when the range is empty.
+
+## --video-solution--
+
+4

curriculum/challenges/english/blocks/algorithms-in-code/linear-search-in-code-video.md

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+---
+id: 698dca057932b3cc4b19c926
+title: Linear Search in Code
+challengeType: 11
+videoId: bKkgjdPkL3A
+dashedName: linear-search-in-code
+---
+
+# --description--
+
+In this video, you will code out the linear search algorithm using Python.
+
+# --questions--
+
+## --text--
+
+Which of the following is the correct way to write a linear search function?
+
+## --answers--
+
+```python
+def linear_search(list, target):
+    for i in range(len(list) - 1):  
+        if list[i] == target:
+            return i
+    return -1
+```
+
+---
+
+```python
+def linear_search(list, target):
+    for i in range(len(list)):
+        if i == target:   
+            return i
+    return -1
+
+```
+
+---
+
+```python
+def linear_search(list, target):
+    for i in range(len(list)):
+        if list[i] == target:
+            return i
+        else:
+            return -1  
+```
+
+---
+
+```python
+def linear_search(list, target):
+    for i in range(len(list)):
+        if list[i] == target:
+            return i  
+    return None
+```
+
+## --video-solution--
+
+4

curriculum/challenges/english/blocks/algorithms-in-code/recursive-binary-search-video.md

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+---
+id: 698dce727932b3cc4b19c928
+title: Recursive Binary Search
+challengeType: 11
+videoId: RQNBzDoG_gA
+dashedName: recursive-binary-search
+---
+
+# --description--
+
+In this video, you will learn how to create a recursive solution for binary search.
+
+# --questions--
+
+## --text--
+
+What is a recursive function?
+
+## --answers--
+
+A function that performs a calculation only once.
+
+---
+
+A function that calls itself.
+
+---
+
+A function that never returns a value.
+
+---
+
+A function that can only run in a loop.
+
+## --video-solution--
+
+2