Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	num, _ := strconv.Atoi(sc.Text())

	fmt.Println(fibonacci(num))
}

func fibonacci(num int) int {
	fibs := make([]int, num+1)

	for i := range fibs {
		if i <= 1 {
			fibs[i] = 1
		} else {
			fibs[i] = fibs[i-1] + fibs[i-2]
		}
	}

	return fibs[num]
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vs = vector<string>;
using msi = map<string, int>;
using mii = map<int, int>;
using psi = pair<string, int>;
using pii = pair<int, int>;
using vlai = valarray<int>;
#define rep(i,n) for(int i=0;i<n;i++)
#define range(i,s,n) for(int i=s;i<n;i++)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define fs first
#define sc second
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define INF 1E9
#define EPS 1E-9
#define MOD (1E9+7)
#define PI 3.1415926535897932384626433832795

std::ostream &operator<<(std::ostream &out, const vector<int> &tgt)
{
	string s;
	for (int i = 0; i<tgt.size(); i++) {
		s += (to_string(tgt[i]) + ((i != tgt.size() - 1) ? " " : ""));
	}
	out << s;
	return out;
}

int main() {
	int n;
	vi fib(45,1);
	for (int i = 2; i < 45; i++) {
		fib[i] = fib[i - 1] + fib[i - 2];
	}
	cin >> n;
	cout << fib[n] << endl;
}

C++: #include <iostream>
#include <stdlib.h>

using namespace std;

int F[44] = {0};

int Fib(int n){

	if(n == 0 || n == 1){
		return (F[n] = 1);
	}

	if(F[n] == 1){
		return F[n];
	}

	return (F[n] = Fib(n-1)+Fib(n-2));
}

int main(){

	int n;

	cin >> n;

	cout << Fib(n) << endl;

	return 0;
}

C++: #define _USE_MATH_DEFINES
#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <string>
#include <vector>
#include <utility>
#include <complex>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <deque>
#include <tuple>
#include <bitset>
#include <limits>
#include <algorithm>
#include <array>
#include <random>
#include <complex>
#include <regex>
#include <iomanip>
using namespace std;
typedef long double ld;
typedef long long ll;
typedef vector<int> vint;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define fcout cout << fixed << setprecision(10)
#define rep(i,n)    for(int i=0; i<(int)n; i++)
#define mp(a,b) make_pair(a,b)
#define pb push_back
#define all(x) x.begin(), x.end()
const ll inf = 1e18;
const ll mod = 1e9 + 7;

int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

int main(){
    int n;
    cin >> n;
    vint fib(n+1, 1);
    for(int i=2; i<n+1; i++){
        fib[i] = fib[i-1] + fib[i-2];
    }
    cout << fib[n] << endl;
}

C++: #include<iostream>
using namespace std;
int dp[50];
int fibonacci(int x){
  if(x==0 || x==1) return dp[x]=1;
  if(dp[x]!=0) return dp[x];
  return dp[x]=fibonacci(x-1)+fibonacci(x-2);
}
int main(){
  int n;
  cin>>n;
  cout<<fibonacci(n)<<endl;
  return 0;
}

C++: #include<iostream>
#include<cstdio>

using namespace std;

int function(int n){
  if(n==0||n==1)return 1;
  return function(n-1)+function(n-2);
}

int main(){
  int n;
  cin>>n;
  cout<<function(n)<<endl;
  return 0;
}

C++: #include <algorithm>
#include <iostream>
#include <math.h>
#include <stdio.h>
#include <string>
#include <sstream>
#include <vector>
#include <set>
#include <stack>
#include <map>
#include <cmath>
#include <queue>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
using namespace std;
typedef unsigned long long ll;
#define MAX_N 100
int d[MAX_N];

void init(){
	rep(i,MAX_N){
		d[i] = -1;
	}
}

int fib(int num){
	if( num == 0) return 1;
	if( num == 1) return 1;
	if(d[num] != -1) return d[num];
	d[num] = fib(num-1) + fib(num-2);
	return d[num];
}


int main()
{
	init();
	int n;
	cin>>n;
	cout<<fib(n)<<endl;
	return 0;
}

C++: #include <stdio.h>
int fib(int);
int fibo[45];
int main(){
  int n,i;
  for(i=0;i<45;i++)fibo[i]=-1;
  scanf("%d",&n);
  printf("%d\n",fib(n));
  return 0;
}
int fib(int n){
  if(n==0 || n==1)return fibo[n]=1;
  if(fibo[n]!=-1)return fibo[n];
  return fibo[n]=fib(n-1)+fib(n-2);
}

C++: 
 // C
 #ifndef _GLIBCXX_NO_ASSERT
 #include <cassert>
 #endif
 #include <cctype>
 #include <cerrno>
 #include <cfloat>
 #include <ciso646>
 #include <climits>
 #include <clocale>
 #include <cmath>
 #include <csetjmp>
 #include <csignal>
 #include <cstdarg>
 #include <cstddef>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 #include <ctime> 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
 #include <ccomplex>
 #include <cfenv>
 #include <cinttypes>
 #include <cstdbool>
 #include <cstdint>
 #include <ctgmath>
 #include <cwchar>
 #include <cwctype>
 #endif
 
 // C++
 #include <algorithm>
 #include <bitset>
 #include <complex>
 #include <deque>
 #include <exception>
 #include <fstream>
 #include <functional>
 #include <iomanip>
 #include <ios>
 #include <iosfwd>
 #include <iostream>
 #include <istream>
 #include <iterator>
 #include <limits>
 #include <list>
 #include <locale>
 #include <map>
 #include <memory>
 #include <new>
 #include <numeric>
 #include <ostream>
 #include <queue>
 #include <set>
 #include <sstream>
 #include <stack>
 #include <stdexcept>
 #include <streambuf>
 #include <string>
 #include <typeinfo>
 #include <utility>
 #include <valarray>
 #include <vector> 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
 #include <array>
 #include <atomic>
 #include <chrono>
 #include <condition_variable>
 #include <forward_list>
 #include <future>
 #include <initializer_list>
 #include <mutex>
 #include <random>
 #include <ratio>
 #include <regex>
 #include <system_error>
 #include <thread>
 #include <tuple>
 #include <typeindex>
 #include <type_traits>
 #include <unordered_map>
 #include <unordered_set>
 #endif
using namespace std;
int dp[50];

int main(){
    int n; cin >> n;
    dp[0] = 1;
    dp[1] = 1;
    for(int i=2;i<=n;++i){
        dp[i] = dp[i-1] + dp[i-2];
    }
    cout << dp[n] << endl;
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int F[114]={};
int fib(int n){
    if(n == 0 || n == 1) return 1;
    else if(F[n] != 0) return F[n];
    else {
        return F[n] = fib(n-1) + fib(n-2);
    }
}

int main() {
    ios::sync_with_stdio(false);
    int n;
    cin >>n;
    fib(n);
    cout << F[n] << endl;
    return 0;
}

C++: #include <iostream>

using namespace std;

int main(void){
  int n;
  cin>>n;
  int A[50];
  for(int i=0;i<50;i++){
    A[i]=0;
  }
  A[0]=1;
  A[1]=1;
  for(int i=2;i<=n;i++){
    A[i]=A[i-1]+A[i-2];
  }
  cout<<A[n]<<endl;
  return 0;
}

C++: #include <bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<(b);i++)
#define erep(i,a,b) for(int i=a;i<=(int)(b);i++)
#define per(i,a,b) for(int i=(b)-1;i>(a);i--)
#define eper(i,a,b) for(int i=((int)(a));i>=b;i--)
#define pb push_back
#define mp make_pair
#define INF (1<<30)-1
#define MOD 1000000007
using namespace std;
typedef long long ll;
int dy[]={0, 0, 1, -1};
int dx[]={1, -1, 0, 0};
int gcd(int a,int b){return b?gcd(b,a%b):a;}

int n, dp[1000];
int main() {
 ios::sync_with_stdio ( false );
 cin.tie ( 0 );
    cin >> n;
    dp[0] = dp[1] = 1;
    erep(i, 2, n) { dp[i] = dp[i - 1] + dp[i - 2]; }
    cout << dp[n] << endl;
    return 0;
}

C++: #include<iostream>
using namespace std;

long long F[100000] = {};
long long f(int);

int main(){
	int n;
	cin >> n;
	cout << f(n) << endl;
	//for(int i = 0;i<n;i++) cerr << f(i) << " ";
	//cerr << endl;
	return 0;
}

long long f(int k){
	if(F[k] != 0) return F[k];
	else if (k <= 1) return F[k] = 1;
	else{
		return F[k] = f(k-1) + f(k-2);
	}
}