He turned to . Sumita Ma'am's table compared Stack vs Queue with real-life examples: "Plates in a cafeteria" for LIFO. He coded push() and pop() in 15 minutes.
Instead of reading the solution, he forced himself to write code. He failed the first time (forgot to convert to lowercase). Failed the second time (indentation error). On the third attempt, it worked.
The examiner nodded. "Good. Clear." Rohan scored 95/100 in Computer Science. Later, a junior asked him, "Which book is best for Class 12 CS?" ip sumita arora class 12
Half the class panicked. Rohan smiled.
"I don't get scope ," Rohan groaned. "Global, local—it's just confusing. And stacks? Don't even start." He turned to
He remembered from Sumita Arora: "A function that checks primality." He remembered Example 5.6 : "Pushing valid data onto a stack."
Implement a stack using a list.
By 2:00 AM, Rohan had solved 12 programming problems. The thick book was no longer a monster—it was a tool . Every concept had an example. Every example had an edge case explained. Every chapter ended with a debugging section that anticipated his exact mistakes.
Meera didn't pick up the book. Instead, she picked up a marker and drew a big box on his whiteboard. "This is your main program." Then she drew a smaller box inside. "This is your function." Instead of reading the solution, he forced himself