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.<\/p>\n
The problem is as follows:<\/p>\n
\n\nGiven N numbers, write a program to sort them in ascending order.\n<\/code>\n<\/pre>\nThe input consists of the first line containing the number of elements N<\/code> (1 \u2264 N \u2264 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.<\/p>\nInput Example<\/h2>\n\n\n5\n5\n4\n3\n2\n1\n<\/code>\n<\/pre>\nOutput Example<\/h2>\n\n\n1\n2\n3\n4\n5\n<\/code>\n<\/pre>\nProblem Solving Process<\/h3>\n
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.<\/p>\n
Step 1: Input Processing<\/h3>\n
First, we receive the data through standard input. We read N<\/code> numbers and store them in a list. To do this, we can use sys.stdin.read<\/code> to read multiple lines of input at once.<\/p>\n\nimport sys\ninput = sys.stdin.read\n\ndata = input().split()\nN = int(data[0])\nnumbers = [int(data[i]) for i in range(1, N + 1)]\n<\/code>\n<\/pre>\nStep 2: Sorting<\/h3>\n
Next, we sort the numbers stored in the list. In Python, we can use the sort()<\/code> method or the sorted()<\/code> function. Both methods have an average performance of O(N log N) based on the Timsort algorithm.<\/p>\n\nnumbers.sort() # Sort the list in place\n# or\nsorted_numbers = sorted(numbers) # Return a new sorted list\n<\/code>\n<\/pre>\nStep 3: Output<\/h3>\n
Finally, we print the sorted numbers line by line. We can use a loop to print each number.<\/p>\n
\nfor num in numbers:\n print(num)\n<\/code>\n<\/pre>\nFull Code<\/h2>\n
Now, when we put it all together, we complete the following code:<\/p>\n
\nimport sys\n\n# Read input\ninput = sys.stdin.read\ndata = input().split()\n\n# Obtain N from the first line and store the remaining numbers in a list\nN = int(data[0])\nnumbers = [int(data[i]) for i in range(1, N + 1)]\n\n# Sort the numbers\nnumbers.sort()\n\n# Output the result\nfor num in numbers:\n print(num)\n<\/code>\n<\/pre>\nConclusion<\/h2>\n
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.<\/p>\n
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!<\/p>\n
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