Fibon code

N-th_Fibonacci/Fibonacci.java

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+
+
+import java.util.Scanner;
+
+public class Fibonacci 
+{
+	double f=0;
+	double mem[]=new double[1001];
+	public static void main(String args[])
+	{
+		Scanner scanner=new Scanner(System.in);
+		int n =scanner.nextInt();
+		System.out.println(n+"-th Fibonacci number is: "+new Fibonacci().fibo2(n));
+		scanner.close();
+	}	
+	public double fibo2(int n)
+	{
+		for(int k=1;k<=n;k++)
+		{
+		if(k<=2)
+			f=1;
+		else
+			f=mem[k-1]+mem[k-2];
+		mem[k]=f;
+		}
+		return mem[n];
+
+	}
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+/*
+ * public double fibo(int n)
+	{
+		if(n<=2)
+			f=1;
+		else
+			f=fibo(n-1)+fibo(n-2);
+		return f;
+
+	}
+
+	public double fibo1(int n)
+	{
+		if(mem[n]!=0)
+			f=mem[n];
+		else if(n<=2)
+			f=1;
+		else
+			f=fibo1(n-1)+fibo1(n-2);
+		mem[n]=f;
+		return f;
+
+	}
+ */

N-th_Fibonacci/Input.txt

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+20
+20-th Fibonacci number is: 6765.0

N-th_Fibonacci/Readme.md

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+# Readme
+
+***n-th Fibonacci using memoization***
+
+Finding the n-th fibonacci number using normal recursive algorithm has a time complexity of O(2^n).
+Here we use a Dynamic Programming approach called Memoization. The answers to subproblems are stored in an array and thereby reducing the number of computations drastically. This Algorithm runs in the order of O(n).
+