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sidde2k01 sidde2k01

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Create fibonacci

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Dynamic Programming
- fibonacci

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`‎Dynamic Programming/fibonacci`

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	`1`	`+#include<iostream>`
	`2`	`+using namespace std;`
	`3`	`+int fibo_3(int n){`
	`4`	`+ int *ans=new int[n+1];`
	`5`	`+ ans[0]=0;`
	`6`	`+ ans[1]=1;`
	`7`	`+ for(int i=2;i<=n;i++){`
	`8`	`+ ans[i]=ans[i-1]+ans[i-2];`
	`9`	`+ }`
	`10`	`+ return ans[n];`
	`11`	`+}`
	`12`	`+int fibo_helper(int n,int* ans){`
	`13`	`+ if(n<=1){`
	`14`	`+ return n;`
	`15`	`+ }`
	`16`	`+ //check if the ouput exists`
	`17`	`+ if(ans[n]!=-1){`
	`18`	`+ return ans[n];`
	`19`	`+ }`
	`20`	`+ //calculate`
	`21`	`+ int a=fibo_helper(n-1,ans);`
	`22`	`+ int b=fibo_helper(n-2,ans);`
	`23`	`+ //save the answer in output`
	`24`	`+ ans[n]=a+b;`
	`25`	`+ //return the answer`
	`26`	`+ return ans[n];`
	`27`	`+}`
	`28`	`+int fibo_2(int n){`
	`29`	`+ int *ans=new int[n+1];`
	`30`	`+ for(int i=0;i<=n;i++){`
	`31`	`+ ans[i]=-1;`
	`32`	`+ }`
	`33`	`+ return fibo_helper(n,ans);`
	`34`	`+}`
	`35`	`+int fibo(int n){`
	`36`	`+ if(n<=1){`
	`37`	`+ return n;`
	`38`	`+ }`
	`39`	`+ return fibo(n-1)+fibo(n-2);`
	`40`	`+}`
	`41`	`+int main(){`
	`42`	`+ int n;`
	`43`	`+ cin>>n;`
	`44`	`+ cout<<fibo_3(n)<<endl;`
	`45`	`+`
	`46`	`+ return 0;`
	`47`	`+}`

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