Solved Problems 🎯
Today, I focused on stack-based problems, tackling three important questions that strengthened my understanding of stack operations and expression evaluation.
1️⃣ Valid Parentheses (🟢 Easy)
✅ Approach:
Used a stack to track open brackets and validate matching pairs.
Checked for proper nesting and balanced parentheses.
💡 Key Learning:
The stack is a perfect data structure for this problem.
Handling edge cases like unbalanced or extra brackets is crucial.
2️⃣ Min Stack (🟡 Medium)
✅ Approach:
Implemented a stack that supports push, pop, top, and retrieving the minimum element in O(1) time.
Used an auxiliary stack or a min-tracking technique.
💡 Key Learning:
- Keeping track of the minimum efficiently is tricky but can be optimized with an extra stack or maintaining a min variable.
3️⃣ Evaluate Reverse Polish Notation (🟡 Medium)
✅ Approach:
Used a stack to process postfix notation (Reverse Polish Notation).
Pushed numbers onto the stack and performed operations when encountering an operator.
💡 Key Learning:
Stack-based evaluation of expressions is powerful.
Handling different operators and ensuring correct precedence is essential.
DevOps Interview Preparation ⚙️
After solving these problems, I shifted my focus to preparing for an upcoming DevOps interview. My preparation included:
✅ Reviewing Cloud Concepts (AWS, Docker, Kubernetes)
✅ CI/CD Pipelines & Automation (GitHub Actions, Jenkins)
✅ Infrastructure as Code (Terraform, Ansible)
It was a productive day balancing DSA practice with DevOps preparation! 🚀
Next Steps ⏭️
🔹 Solve more stack-based and queue-related problems.
🔹 Continue DevOps interview prep and brush up on networking concepts.
🔹 Stay consistent with daily problem-solving!