Replace endl with "\n" because endl is too old school

[Ayushman-Saha]

2025-01-CP/test-02-20001.cpp

Line 45 in 6103ef2

cout << endl;

Update the code to replace the usage of endl with the newline character \n. While endl is commonly used for newlines, it's considered "old school" or less efficient. Using \n is more lightweight and recommended when just adding a newline.