DSA Crash Course [Part 38] - Binary Tree Warm Up Lecture

In this lecture, Alvin goes over the python implementation for a basic binary tree.

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 37] - Binary Tree Intro Lecture

In this lecture, Alvin explains the basic structure of a binary tree.

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 36] - Want To Learn More DSA With Alvin?

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 35] - Zipper Lists Walkthrough

In this lesson, Alvin walks through the python implementation for the *zipper_lists* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/zipper-lists?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 34] - Zipper Lists Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *zipper_lists*, that takes in the head of two linked lists as arguments. The function should zipper the two lists together into single linked list by alternating nodes. If one of the linked lists is longer than the other, the resulting list should terminate with the remaining nodes. The function should return the head of the zippered linked list.
>
> Do this **in-place**, by mutating the original Nodes.
>
> You may assume that both input lists are non-empty.

```
a = Node("a")
b = Node("b")
c = Node("c")
a.next = b
b.next = c
# a -> b -> c

x = Node("x")
y = Node("y")
z = Node("z")
x.next = y
y.next = z
# x -> y -> z

zipper_lists(a, x)
# a -> x -> b -> y -> c -> z
```

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
e = Node("e")
f = Node("f")
a.next = b
b.next = c
c.next = d
d.next = e
e.next = f
# a -> b -> c -> d -> e -> f

x = Node("x")
y = Node("y")
z = Node("z")
x.next = y
y.next = z
# x -> y -> z

zipper_lists(a, x)
# a -> x -> b -> y -> c -> z -> d -> e -> f
```

```
s = Node("s")
t = Node("t")
s.next = t
# s -> t

one = Node(1)
two = Node(2)
three = Node(3)
four = Node(4)
one.next = two
two.next = three
three.next = four
# 1 -> 2 -> 3 -> 4

zipper_lists(s, one)
# s -> 1 -> t -> 2 -> 3 -> 4
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 33] - Reverse List Walkthrough

In this lesson, Alvin walks through the python implementation for the *reverse_list* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/reverse-list?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 32] - Reverse List Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *reverse_list*, that takes in the head of a linked list as an argument. The function should reverse the order of the nodes in the linked list **in-place** and return the new head of the reversed linked list.

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
e = Node("e")
f = Node("f")
a.next = b
b.next = c
c.next = d
d.next = e
e.next = f

# a -> b -> c -> d -> e -> f
reverse_list(a) # f -> e -> d -> c -> b -> a
```

```
x = Node("x")
y = Node("y")
x.next = y

# x -> y
reverse_list(x) # y -> x
```

```
p = Node("p")

# p
reverse_list(p) # p
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 31] - Get Node Value Walkthrough

In this lesson, Alvin walks through the python implementation for the *get_node_value* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/get-node-value?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 30] - Get Node Value Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *get_node_value*, that takes in the head of a linked list and an index. The function should return the value of the linked list at the specified index.
>
> If there is no node at the given index, then return *None*.

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 2) # 'c'
```

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 3) # 'd'
```

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 7) # None
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 29] - Linked List Find Walkthrough

In this lesson, Alvin walks through the python implementation for the *linked_list_find* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/linked-list-find?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 28] - Linked List Find Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *linked_list_find*, that takes in the head of a linked list and a target value. The function should return a boolean indicating whether or not the linked list contains the target.

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
linked_list_find(a, "c") # True
```

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
linked_list_find(a, "d") # True
```

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
linked_list_find(a, "q") # False
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 27] - Sum List Walkthrough

In this lesson, Alvin walks through the python implementation for the *sum_list* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/sum-list?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 26] - Sum List Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *sum_list*, that takes in the head of a linked list containing numbers as an argument. The function should return the total sum of all values in the linked list.

```
a = Node(2)
b = Node(8)
c = Node(3)
d = Node(-1)
e = Node(7)
a.next = b
b.next = c
c.next = d
d.next = e

# 2 -> 8 -> 3 -> -1 -> 7
sum_list(a) # 19
```

```
x = Node(38)
y = Node(4)
x.next = y

# 38 -> 4
sum_list(x) # 42
```

```
z = Node(100)

# 100
sum_list(z) # 100
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 25] - Linked List Values Walkthrough

In this lesson, Alvin walks through the python implementation for the *linked_list_values* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/linked-list-values?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 24] - Linked List Values Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function, *linked_list_values*, that takes in the head of a linked list as an argument. The function should return a list containing all values of the nodes in the linked list.

```
a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d

linked_list_values(a) # -> [ 'a', 'b', 'c', 'd' ]
```

```
x = Node("x")
y = Node("y")
x.next = y

# x -> y

linked_list_values(x) # -> [ 'x', 'y' ]
```

```
q = Node("q")

# q

linked_list_values(q) # -> [ 'q' ]
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 23] - Linked List Warm Up Lecture

In this lecture, Alvin goes over how to implement a linked list in python.

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 22] - Linked List Intro Lecture

In this lecture, Alvin explains the basic structure of a singly-linked list.

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 21] - Sum Numbers Recursive Walkthrough

In this lesson, Alvin walks through the python implementation for the *sum_numbers_recursive* problem.

Code along and test your work in the following editor workspace: <https://structy.net/problems/sum-numbers-recursive?language=py>

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 20] - Sum Numbers Recursive Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

> Write a function *sum_numbers_recursive* that takes in an array of numbers and returns the sum of all the numbers in the array. All elements will be integers. Solve this recursively.

```
sum_numbers_recursive([5, 2, 9, 10]); # -> 26
```

```
sum_numbers_recursive([1, -1, 1, -1, 1, -1, 1]); # -> 1
```

```
sum_numbers_recursive([]); # -> 0
```

```
sum_numbers_recursive([1000, 0, 0, 0, 0, 0, 1]); # -> 1001
```

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

DSA Crash Course [Part 19] - Recursion Warm Up Lecture

In this lecture, Alvin explains some basic recursive function examples.

If you need additional support taking these DSA skills and actually applying them, take [**Alvin's**](https://www.linkedin.com/in/alvin-zablan-b73a92117/) *complete* data structures and algorithms course on [**Structy**](https://structy.net/?utm_source=taro). You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

Use [**this link to get 20% off**](https://structy.net/purchase?promo_code=taro20) the entire Structy DSA learning experience.

Follow Alvin on LinkedIn: <https://www.linkedin.com/in/alvin-zablan-b73a92117/>

Tech Career Growth Videos

Our instructional videos provide software engineers with insights needed for career growth. Masterclasses go incredibly in-depth on a specific tech topic while case studies are real examples from established engineering leaders.