Hello! In this post, we will cover the problem ‘Sorting Numbers 1’ as a preparation for the algorithm exam. This problem helps to understand a simple sorting algorithm and is one of the common topics in coding tests. Let’s take a look at the problem.
Problem Description
The problem is as follows:
Given N numbers, write a program to sort them in ascending order.
The input consists of the first line containing the number of elements N (1 ≤ N ≤ 1,000,000). From the second line onwards, N lines will contain the numbers. The numbers are integers with an absolute value less than or equal to 1,000,000.
Input Example
5
5
4
3
2
1
Output Example
1
2
3
4
5
Problem Solving Process
To solve this problem, we need to sort the input numbers in ascending order. There are various algorithms for sorting, but in Python, we can easily solve it by utilizing built-in functions.
Step 1: Input Processing
First, we receive the data through standard input. We read N numbers and store them in a list. To do this, we can use sys.stdin.read to read multiple lines of input at once.
import sys
input = sys.stdin.read
data = input().split()
N = int(data[0])
numbers = [int(data[i]) for i in range(1, N + 1)]
Step 2: Sorting
Next, we sort the numbers stored in the list. In Python, we can use the sort() method or the sorted() function. Both methods have an average performance of O(N log N) based on the Timsort algorithm.
numbers.sort() # Sort the list in place
# or
sorted_numbers = sorted(numbers) # Return a new sorted list
Step 3: Output
Finally, we print the sorted numbers line by line. We can use a loop to print each number.
for num in numbers:
print(num)
Full Code
Now, when we put it all together, we complete the following code:
import sys
# Read input
input = sys.stdin.read
data = input().split()
# Obtain N from the first line and store the remaining numbers in a list
N = int(data[0])
numbers = [int(data[i]) for i in range(1, N + 1)]
# Sort the numbers
numbers.sort()
# Output the result
for num in numbers:
print(num)
Conclusion
The problem ‘Sorting Numbers 1’ is simple but requires an understanding of sorting algorithms. By leveraging Python’s powerful built-in features, we can solve the problem very easily. It is important to start with these simple problems and systematically study algorithms.
Through this post, we learned about the process of solving sorting problems and the useful features of Python. In the next post, I will present a more complex algorithmic problem. Thank you!