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Using Memoization for Fibonacci sequence #1

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Using Memoization for Fibonacci sequence #1

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27 changes: 27 additions & 0 deletions memoization.cpp
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Original file line number Diff line number Diff line change
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#include<bits/stdc++.h>
#include<iostream>
#define mod 1000000007
typedef long long int lli;
lli fib(lli n,lli memo[])
{
lli res;
if(memo[n]!=0)
return memo[n];
if(n==1 || n==2)
res = 1;
else
res = fib(n-1,memo) + fib(n-2,memo);
memo[n]=res;
return res;
}
using namespace std;
int main()
{
lli memo[100000]={0},n,p;
cout<<"Enter the value of n :\n";
cin>>n;
p = fib(n,memo);
cout<<p<<endl;
return 0;
}