**Recursion: Fibonacci Numbers**

### Problem Statement :

The Fibonacci Sequence The Fibonacci sequence appears in nature all around us, in the arrangement of seeds in a sunflower and the spiral of a nautilus for example. The Fibonacci sequence begins with fibonacci(0) = 0 and fibonnaci(1) = 1 as its first and second terms. After these first two elements, each subsequent element is equal to the sum of the previous two elements. Programmatically: fibonacci(0) = 0 fibonacci(1) = 1 fibonacci(n) = fibonacci( n - 1 ) + fibonacci( n - 2 ) Function Description Complete the recursive function fibonacci in the editor below. fibonacci has the following parameter(s): int n: the index of the sequence to return Returns - int: the nth element in the Fibonacci sequence Input Format The integer n. Constraints 0 <= n <= 30

### Solution :

` ````
Solution in C :
In C :
if(n == 0)
return 0;
else if(n == 1)
return 1;
else
return fibonacci(n-1)+fibonacci(n-2);
```

` ````
Solution in C++ :
In C ++ :
// Complete the function.
if(n==0)
return 0;
else if(n==1)
return 1;
else
return (fibonacci(n-1)+fibonacci(n-2));
```

` ````
Solution in Java :
In Java :
// Complete the function.
if(n == 0) return 0;
if(n == 1) return 1;
return fibonacci(n - 1) + fibonacci(n - 2);
```

` ````
Solution in Python :
In Python3 :
cache = {0:0, 1:1}
def fibonacci(n):
try:
return cache[n]
except KeyError:
cache[n] = fibonacci(n - 1) + fibonacci(n - 2)
return cache[n]
n = int(input())
print(fibonacci(n))
```

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