Go: package main

/*
フィボナッチ数列
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func fibWithMemo(n int, memo map[int]int) int {
	if n == 0 || n == 1 {
		return 1
	}
	if val, ok := memo[n]; ok {
		return val
	}
	memo[n] = fibWithMemo(n-1, memo) + fibWithMemo(n-2, memo)
	return memo[n]
}

func fib(n int) int {
	memo := make(map[int]int)
	return fibWithMemo(n, memo)
}

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	fmt.Println(fib(n))
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}
func min(a []int) int {
	m := a[0]
	for _, v := range a {
		if v < m {
			m = v
		}
	}
	return m
}

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

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

int main(){
    int n;
    cin >> n;
    int F[50];
    F[0] = F[1] = 1;
    for(int i = 2; i <= n; i++) F[i] = F[i-1] + F[i-2];

    cout << F[n] << endl;

    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define MAX_N 100000
#define MAX_M 100000
const int INF = 1e9;

int fib(int n){
  vector<long long> dp(n+1);
  dp[0]=1;
  dp[1]=1;
  for(int i=2;i<=n;i++){
    dp[i]=dp[i-1]+dp[i-2];
  }
  return dp[n];
}

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

C++: #include <cstdio>

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

int main(){
	int n;
	scanf("%d", &n);
	printf("%d\n", fib(n));
	return 0;
}

C++: #include<iostream>
using namespace std;
const int MAX = 44;
int dp[MAX];
int fib(int n)
{
	if (n == 0 || n == 1)
		return dp[n] = 1;
	if (dp[n] != -1)
		return dp[n];
	return dp[n] = fib(n - 1) + fib(n - 2);
}
int main()
{
	int n;
	cin >> n;
	for (int i = 0; i <= MAX; i++)
		dp[i] = -1;
	cout << fib(n) << endl;}

C++: #include <bits/stdc++.h>

using namespace std;
const int dx[]={1,0,-1,0,1,-1,-1,1,0};
const int dy[]={0,1,0,-1,1,1,-1,-1,0};
const int INF = 1e9+101;
const long long LINF = 1e18;
const double EPS = 1e-8;
#define pb push_back
#define mk make_pair
#define fr first
#define sc second
#define reps(i,j,k) for(int i = (j); i < (k); ++i)
#define rep(i,j) reps(i,0,j)
#define all(a) (a).begin(),(a).end()
#define MOD 1000000007
typedef long long ll;
typedef pair<int,int> Pii;
typedef pair<ll, ll> Pll;
typedef pair<Pii,int> P;
typedef vector<int> vi;
typedef vector<ll> vll;
template<class T>
ostream& operator<<(ostream &out, const vector<T> &v){
	out << "{";
	rep(i,v.size()){
		out << v[i] <<", ";
	}
	return out << "}" << endl;
}
int memo[50];
int solve(int l) {
    if(memo[l] != -1) return memo[l];
    if(l <= 1) return 1;
    return memo[l] = solve(l-1)+solve(l-2);
}
int main() {
    memset(memo,-1,sizeof(memo));
    int N;
    cin >> N;
    cout << solve(N) << endl;
    return 0;  
}

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

int F[100];
int main() {
  F[0] = 1;
  F[1] = 1;

  for (int i = 2; i < 45; ++i) {
    F[i] = F[i-2] + F[i-1];
  }

  int N;
  cin >> N;
  cout << F[N]<<endl;
}

C++: #include<stdio.h>
int main(){
  int A[44]={},a,i;
  A[0]=1;
  A[1]=1;
  scanf("%d",&a);
  for(i=2;i<=a;i++){
    A[i]+=(A[i-1]+A[i-2]);
  }
  printf("%d\n",A[a]);
}

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

typedef unsigned long long ull;
int dp[45] = {0};

ull fib(int n) {
  // ???????????????
  if(dp[n] != 0)return dp[n];
  if(n == 1 || n == 0)return 1;
  return dp[n] = fib(n - 2) + fib(n - 1);
}

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

C++: #include<stdio.h>

#define MAX 50

int db[MAX];

int fibonacci(int n) {
    if (n == 0 || n == 1) return 1;
    if (db[n] != -1) return db[n];
    return db[n] = fibonacci(n - 1) + fibonacci(n - 2);
}

int main() {
    int n;
    for (int i = 0; i < MAX; ++i) db[i] = -1;

    scanf("%d", &n);
    int result = fibonacci(n);
    printf("%d\n", result);
    return 0;
}

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

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

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

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

long long fib[50] = {};

void Fib(long long n) {
    if(n == 0 || n == 1) fib[n] = 1;
    else fib[n] =  fib[n -1] + fib[n - 2];
}

int main(void) {
    int n;
    scanf("%d", &n);
    
    for(int i = 0; i < 50; ++i) Fib(i);
    
    printf("%d\n", fib[n]);
    
    return 0;
}

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

ll fibonacci(ll n) {
  if(n < 2)
    return 1;
  return fibonacci(n-1)+fibonacci(n-2);
}
int main() {
  ll n;
  cin >> n;
  cout << fibonacci(n) << endl;
}

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

int main()
{
  cout<<"Hallo World"<<endl;
}

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

int memo[45], n;

void init(){
  for(int i = 0; i <= n; i++){
    memo[i] = -1;
  }
}

int fibo(int d){
  if(memo[d] >= 0) return memo[d];
  if(d == 0 || d == 1) return memo[d] = 1;
  return memo[d] = fibo(d - 1) + fibo(d - 2);
}

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

C++: //Fibonacci Number
#include <iostream>

using namespace std;

const int NIL = -1;

int fibonacci(int n) {
    if(n == 0 || n == 1) return 1;

    int dp[n+1];
    dp[0] = 1; dp[1] = 1;
    for(int i=2; i<n+1; i++) dp[i] = dp[i-1] + dp[i-2];
    return dp[n];
}

int main() {
    int n;
    cin >> n;
    cout << fibonacci(n) << endl;
}

C++: #include <stdio.h>

int main(void) {
	int n;
	int F[45];
	scanf("%d", &n);
	F[0] = F[1] = 1;
	for (int i = 2; i <= 44; i ++) {
		F[i] = F[i-1] + F[i-2];
	}
	printf("%d\n", F[n]);
	return 0;
}

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

using namespace std;

int n,dp[50];

int fib(int n)
{
    if(n==0||n==1){
        return dp[n]=1;
    }
    if(dp[n]!=-1){
        return dp[n];
    }
    return dp[n]=fib(n-1)+fib(n-2);
}

int main()
{
    for(int i=0;i<50;i++){
        dp[i]=-1;
    }
    scanf("%d",&n);
    printf("%d\n",fib(n));
    return 0;
}