Find the Nth Term of the Fibonacci Series
Detailed guide and Python implementation for the 'Find the Nth Term of the Fibonacci Series' problem.
1. Concept Overview
The 'Find the Nth Term of the Fibonacci Series' problem is a key challenge in the Basics section.
This implementation focuses on easy-level logic in Python.
We prioritize technical accuracy and code readability in our provided solutions.
2. Real-World Applications
3. Visual Intuition
Visualizing the logic flow for Find the Nth Term of the Fibonacci Series.
4. Prerequisites
5. Step-by-Step Thinking
1. Understand the problem
Read the problem statement for Find the Nth Term of the Fibonacci Series carefully.
2. Formulate brute force
Draft a simple iterative solution.
3. Identify inefficiency
Look for redundant calculations.
4. Optimize search path
Use hashing or sorting to speed up the process.
5. Final Implementation
Clean up the code for production standards.
Problem Statement
Write a function fibonacci_nth(n) that takes a positive integer n and returns the nth term of the Fibonacci series (1-indexed). The series is: F(1) = 0, F(2) = 1, F(3) = 1, F(4) = 2, F(5) = 3, ...
- •1 <= n <= 50
Examples
n = 5
3
The 5th Fibonacci term is 3. The series: 0, 1, 1, 2, 3.
n = 1
0
The 1st Fibonacci term is 0.
n = 10
34
The 10th Fibonacci term is 34. The series: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
Ready to Solve?
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Interview Insights & Variations
Complexity Analysis Breakdown
Why Time: Directly evaluates all possibilities.
Why Space: Uses standard local memory.
Why Time: Optimized paths reduce total operations.
Why Space: May trade memory for speed.
Optimized Solution Python Code
Optimized Solution Python Code
def nth_fib_opt(n: int) -> int:
if n <= 1: return n
a, b = 0, 1
for _ in range(2, n + 1):
a, b = b, a + b
return bBrute Force Code (Spoiler Guarded)
Brute Force Code (Spoiler Guarded)
def nth_fib_brute(n: int) -> int:
if n <= 1: return n
return nth_fib_brute(n-1) + nth_fib_brute(n-2)Algorithm Pattern Checklist
When dealing with Basics data patterns.
Core Prerequisites
Revision Key Notes
Common Mistakes & Pitfalls
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