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Hey Python coders!
We apologize for the radio silence for the past few months. Life got a bit busy with.
But the good news is, we're BACK and itching to get coding with you again! We've got some awesome Python content planned, so stay tuned!
What coding challenges are you facing right now? Hit the comments and let us know!
We apologize for the radio silence for the past few months. Life got a bit busy with.
But the good news is, we're BACK and itching to get coding with you again! We've got some awesome Python content planned, so stay tuned!
What coding challenges are you facing right now? Hit the comments and let us know!
👍4
#binary_search Given a sorted array of integers (ascending order) and a target value, write a function to find the target's index in the array. If the target isn't found, return -1.
Constraints:
Use an algorithm with O(log n) time complexity.
Example:
Input: nums = [-1,0,3,5,9,12], target = 9
Output: 4
Can you solve it efficiently?
Constraints:
Use an algorithm with O(log n) time complexity.
Example:
Input: nums = [-1,0,3,5,9,12], target = 9
Output: 4
Can you solve it efficiently?
👍1
def binary_search(nums, target):
"""
Performs a binary search on a sorted array to find the index of a target value.
Args:
nums: A sorted list of integers (ascending order).
target: The integer value to search for.
Returns:
The index of the target in the list if found, otherwise -1.
"""
left, right = 0, len(nums) - 1
while left <= right:
# Find the middle index
middle = (left + right) // 2
# Check if the target is at the middle index
if nums[middle] == target:
return middle
# If the target is less than the middle element, search the left half
elif nums[middle] > target:
right = middle - 1
# If the target is greater than the middle element, search the right half
else:
left = middle + 1
# If the loop exits without finding the target, return -1
return -1
# Example usage
nums = [-1, 0, 3, 5, 9, 12]
target = 9
result = binary_search(nums, target)
if result != -1:
print(f"Target {target} found at index {result}")
else:
print(f"Target {target} not found in the list")
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1The function binary_search takes a sorted array nums and a target value target as input.
2. It initializes two variables, left and right, which represent the left and right ends of the search interval, respectively. Initially, left is set to 0 and right is set to the length of the array minus 1.
3.The function enters a while loop that continues as long as left is less than or equal to right. This means that the search interval is still valid.
4.Inside the loop, the function calculates the middle index of the search interval using the formula middle = (left + right) // 2.
5.The function then checks if the target value is at the middle index of the array (nums[middle] == target).
6.If the target is found at the middle index, the function returns the middle index.
7.If the target is less than the value at the middle index (nums[middle] > target), it means that the target must be in the left half of the array. So the function updates the right pointer to middle - 1 to exclude the right half from the search interval.
8.If the target is greater than the value at the middle index (nums[middle] < target), it means that the target must be in the right half of the array. So the function updates the left pointer to middle + 1 to exclude the left half from the search interval.
If the loop exits without finding the target, it means that the target is not present in the array. The function returns -1 in this case.
2. It initializes two variables, left and right, which represent the left and right ends of the search interval, respectively. Initially, left is set to 0 and right is set to the length of the array minus 1.
3.The function enters a while loop that continues as long as left is less than or equal to right. This means that the search interval is still valid.
4.Inside the loop, the function calculates the middle index of the search interval using the formula middle = (left + right) // 2.
5.The function then checks if the target value is at the middle index of the array (nums[middle] == target).
6.If the target is found at the middle index, the function returns the middle index.
7.If the target is less than the value at the middle index (nums[middle] > target), it means that the target must be in the left half of the array. So the function updates the right pointer to middle - 1 to exclude the right half from the search interval.
8.If the target is greater than the value at the middle index (nums[middle] < target), it means that the target must be in the right half of the array. So the function updates the left pointer to middle + 1 to exclude the left half from the search interval.
If the loop exits without finding the target, it means that the target is not present in the array. The function returns -1 in this case.
Question 2 on #binary_search Binary Search: Treasure Hunt!
Imagine searching for buried treasure on a coastline. You have distances to the treasure from various points (sorted from smallest to biggest).
Binary search helps find the closest distance to the treasure from your ship's location. It works by repeatedly guessing the middle distance and checking if it's the treasure or closer than your acceptable range (tolerance).
It's super fast for sorted lists (like your treasure distances).
Think of eliminating half the coastline on each guess!
Example:
Ship at distance 50 meters. Tolerance 10 meters.
Distances: [10, 20, 40, 60, 80]
Binary search would check:
Middle distance (40 meters) - too far, but closer than 60 meters!
Left half (now 10, 20, 40) - Bingo! 40 meters is closest within tolerance.
Imagine searching for buried treasure on a coastline. You have distances to the treasure from various points (sorted from smallest to biggest).
Binary search helps find the closest distance to the treasure from your ship's location. It works by repeatedly guessing the middle distance and checking if it's the treasure or closer than your acceptable range (tolerance).
It's super fast for sorted lists (like your treasure distances).
Think of eliminating half the coastline on each guess!
Example:
Ship at distance 50 meters. Tolerance 10 meters.
Distances: [10, 20, 40, 60, 80]
Binary search would check:
Middle distance (40 meters) - too far, but closer than 60 meters!
Left half (now 10, 20, 40) - Bingo! 40 meters is closest within tolerance.
What is the output of the following code?
```
number = 5 number = number * 2 print(number)```
```
number = 5 number = number * 2 print(number)```
Anonymous Quiz
6%
A) 5
62%
B) 10
28%
C) An error
4%
D)2
What does the following code snippet do?
Python
my_list = [1, 2, 3, 4] print(my_list[1])
Python
my_list = [1, 2, 3, 4] print(my_list[1])
Anonymous Quiz
27%
1
66%
2
2%
3
5%
4
Forwarded from Leetcode with dani
6. What is the output of the following code?
X = 3 y = 5 z = x if x < y: print(z)
X = 3 y = 5 z = x if x < y: print(z)
Anonymous Quiz
75%
A. 3
5%
B. 5
19%
C. x
1%
D. y
Forwarded from Leetcode with dani
4. Which of the following is NOT a valid data type in Python?
Anonymous Quiz
6%
int
4%
float
75%
variable
15%
boolean
Forwarded from Dani
in programming counting (indexing) starts from zero so 1 indicates the second element in the list
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Want to test your Python skills? Look no further! All the practice questions for beginners are pinned in the first message of this channel.
Feel free to answer the questions at your own pace and refer back to them whenever you need a refresher. If you have any questions or need help with a specific concept, don't hesitate to ask in the chat!
Happy coding!
Forwarded from Leetcode with dani
Welcome to your first day of Python programming! Today, we will be introducing you to the basics of Python programming and getting you started on your journey to becoming a proficient Python programmer.
First, let's start with the basics. Python is a high-level, interpreted programming language that is widely used for web development, data analysis, artificial intelligence, and many other applications. It is known for its simplicity, readability, and ease of use, making it a great language for beginners to learn.
To get started with Python, you will need to install Python on your computer. You can download the latest version of Python from the official Python website (https://www.python.org/downloads/). Once you have installed Python, you can open the Python interpreter, which is a command-line interface that allows you to enter Python code and see the results.
Let's start with a simple example. Open the Python interpreter and type the following code:
print("Hello, world!")
Press enter, and you should see the output "Hello, world!" printed on the screen. Congratulations, you have just written your first Python program!
Now, let's take a closer look at the code. The print() function is a built-in function in Python that allows you to print text to the screen. In this case, we are printing the text "Hello, world!" to the screen. The text is enclosed in double quotes, which tells Python that it is a string.
Next, let's talk about variables. In Python, a variable is a name that represents a value. You can assign a value to a variable using the assignment operator =. For example:
x = 5
This assigns the value 5 to the variable x. You can then use the variable x in your code:
print(x)
This will print the value of x, which is 5.
Variables can also be assigned to other variables:
x = 5
y = x
print(y)
This will print the value of y, which is also 5, because we assigned y to the value of x.
You can also perform arithmetic operations on variables:
x = 5
y = 3
print(x + y) # prints 8
print(x - y) # prints 2
print(x * y) # prints 15
print(x / y) # prints 1.6666666666666667
This will perform arithmetic operations on the variables x and y and print the results to the screen.
That's it for today's lesson! We hope you have enjoyed your introduction to Python programming, and we look forward to teaching you more in the coming days.
First, let's start with the basics. Python is a high-level, interpreted programming language that is widely used for web development, data analysis, artificial intelligence, and many other applications. It is known for its simplicity, readability, and ease of use, making it a great language for beginners to learn.
To get started with Python, you will need to install Python on your computer. You can download the latest version of Python from the official Python website (https://www.python.org/downloads/). Once you have installed Python, you can open the Python interpreter, which is a command-line interface that allows you to enter Python code and see the results.
Let's start with a simple example. Open the Python interpreter and type the following code:
print("Hello, world!")
Press enter, and you should see the output "Hello, world!" printed on the screen. Congratulations, you have just written your first Python program!
Now, let's take a closer look at the code. The print() function is a built-in function in Python that allows you to print text to the screen. In this case, we are printing the text "Hello, world!" to the screen. The text is enclosed in double quotes, which tells Python that it is a string.
Next, let's talk about variables. In Python, a variable is a name that represents a value. You can assign a value to a variable using the assignment operator =. For example:
x = 5
This assigns the value 5 to the variable x. You can then use the variable x in your code:
print(x)
This will print the value of x, which is 5.
Variables can also be assigned to other variables:
x = 5
y = x
print(y)
This will print the value of y, which is also 5, because we assigned y to the value of x.
You can also perform arithmetic operations on variables:
x = 5
y = 3
print(x + y) # prints 8
print(x - y) # prints 2
print(x * y) # prints 15
print(x / y) # prints 1.6666666666666667
This will perform arithmetic operations on the variables x and y and print the results to the screen.
That's it for today's lesson! We hope you have enjoyed your introduction to Python programming, and we look forward to teaching you more in the coming days.
Python.org
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The official home of the Python Programming Language
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