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>
#include<cstdio>
#define Lens 50
using namespace std;

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

C++: #include <bits/stdc++.h>
#define REP(i,n) for(int i=0;i<(n);++i)
using namespace std;

int fibonacci[44];

int fib(int n){
    if(fibonacci[n]!=0){
        return fibonacci[n];
    }

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

    fibonacci[n] = fib(n-1) + fib(n-2);
    return fibonacci[n];
}

int fib2(int n){
    if(n==1 || n==0){
        return 1;
    }
    return fib2(n-1) + fib2(n-2);
}

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

C++: #include <iostream>

using namespace std;

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

int main()
{
  int n;
  cin >> n;

  cout << fib(n) << endl;

  return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
#define FOR(i,b,e) for(int i=b;i<e;i++)
#define REP(i,n) FOR(i,0,n)
using namespace std;

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

int main() {
	cin.tie(0);
 	ios::sync_with_stdio(false);

  int n;
  cin >> n;
  int dp[n+1];
  REP(i, n+2) {
    if (i == 0 || i == 1) dp[i] = 1;
    else dp[i] = -1;
  }

  cout << fib(n, dp) << endl;
}

C++: #define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <cstdio>
#include <vector>
#include <string>
#include <array>
#include <queue>
#include <deque>
#include <set>
#include <unordered_set>
#include <list>
#include <map>
#include <stack>
#include <utility>
#include <bitset>
#include <complex>
#include <algorithm>
#include <numeric>
#include <cstdlib>
#include <cmath>
#include <cctype>
#include <cstring>
#include <climits>
#include <random>
#include <functional>
#include <sstream>
#include <iomanip>

using namespace std;

#define rep(i, n) for(int i=0; i<(n); ++i)
#define FOR(i, m, n) for(int i=(m); i<(n); ++i)
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
#define SORT(x) sort((x).begin(),(x).end())
#define REVE(x) reverse((x).begin(),(x).end())
#define mp make_pair
#define pb push_back
#define Cout(x) cout << (x) << endl
#define Cout2(x, y) cout << (x) << " " << (y) << endl
#define dump(x) cout << #x << " = " << (x) << endl;
#define forauto(i, a) for(auto i : a)cout << i << " "; puts("");

typedef long long LL;
typedef vector<int> VI;
typedef vector<LL> VL;
typedef vector<string> VS;
typedef vector<bool> VB;
typedef vector<vector<int>> VVI;
typedef pair<int, int> PII;
typedef pair<double, double> PDD;
typedef complex<double> CD;

int main() {
	LL fib[47];
	fib[0] = 1;
	fib[1] = 1;
	FOR(i, 2, 45)fib[i] = fib[i - 1] + fib[i - 2];

	int n; cin >> n;
	cout << fib[n] << endl;
}

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

int main(){
  int n=0;
  int fib[55]={};
  cin>>n;
  fib[0]=fib[1]=1;
  for(int i=2;i<=n;i++){
    fib[i]=fib[i-1]+fib[i-2];
  }
  cout<<fib[n]<<endl;
  return 0;
}

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

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

  cout << fn[n] << endl;
}
return 0;
}

C++: #include<cstdio>

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

C++: #include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(obj) (obj).begin(),(obj).end()

int main(){
    int m;
    cin>>m;
    int a[44];
    a[0]=1;
    a[1]=1;
    for(int i=2;i<=m;i++){
        a[i]=a[i-1]+a[i-2];
    }
    cout<<a[m]<<endl;
    return 0;
}

C++: #include <iostream>

using namespace std;

int fib(int n);

int main() {
int n;
int dp[45];

dp[0] = 1;
dp[1] = 1;

cin >> n;

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

cout << dp[n] << endl;
return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
        int n;
        cin >> n;
        if (n <= 1) {
                cout << 1;
                return 0;
        }

        int *fib = new int[n + 1];
        fib[0] = fib[1] = 1;
        for (int i = 2; i <= n; i++) {
                fib[i] = fib[i - 1] + fib[i - 2];
        }
        cout << fib[n] << endl;
        delete [] fib;

        return 0;
}

C++: #include<stdio.h>

int fib(int);
int f[45];

int main()
{
  int a,n;

  scanf("%d",&n);

  a = fib(n);
  printf("%d\n",a);

  return 0;
}

int fib(int n){

  int a;

  if(a == f[n])
    return a;
  
  if(n==0 || n==1){
    a = 1;
  }
  else
    a = fib(n-1)+fib(n-2);

  f[n] = a;
  return a;
}

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<iostream>

using namespace std;

unsigned long memo[50] = {};

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

	cin >> n;

	cout << fib(n) << endl;

	return 0;
}