Fibonacci Number LeetCode Solution – Queslers

Problem – Fibonacci Number LeetCode Solution

The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is,

F(0) = 0, F(1) = 1
F(n) = F(n - 1) + F(n - 2), for n > 1.

Given n, calculate F(n).

Example 1:

Input: n = 2
Output: 1
Explanation: F(2) = F(1) + F(0) = 1 + 0 = 1.

Example 2:

Input: n = 3
Output: 2
Explanation: F(3) = F(2) + F(1) = 1 + 1 = 2.

Example 3:

Input: n = 4
Output: 3
Explanation: F(4) = F(3) + F(2) = 2 + 1 = 3.

Constraints:

  • 0 <= n <= 30

Fibonacci Number LeetCode Solution in Java

class Solution 
{
    public int fib(int N)
    {
        if(N <= 1)
            return N;
        
		int a = 0, b = 1;
		
		while(N-- > 1)
		{
			int sum = a + b;
			a = b;
			b = sum;
		}
        return b;
    }
}

Fibonacci Number LeetCode Solution in Python

def fib(N):
	if N == 0: return 0
	if N == 1: return 1
	return fib(N-1) + fib(N-2)

Fibonacci Number LeetCode Solution in C++

    int fib(int N) {
        if(N == 0)  return 0;
        if(N == 1)  return 1;
        return fib(N-1) + fib(N-2);
    }
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