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 <vector>
#include <set>
#include <algorithm>
#include <string>
#include <istream>

#define INPUT_FROM_FILE (0)
#if INPUT_FROM_FILE
#include <fstream>
#endif

int main(int argc, char **argv){
#if INPUT_FROM_FILE
	std::ifstream ifs("test.txt");
#endif
	int n = 0;

#if INPUT_FROM_FILE
	ifs >> n;
#else
	std::cin >> n;
#endif
	if(n == 0){
		std::cout << "1" << std::endl;
	}
	else if(n == 1){
		std::cout << "1" << std::endl;
	}
	else{
		int pp = 1;
		int p = 1;
		int ans = 0;

		for(int i = 2; i <= n; i++){
			ans = p + pp;

			pp = p;
			p = ans;
		}
		std::cout << ans << std::endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin >> n;
    int dp[n+1];
    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;
}

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];
        delete [] fib;

        return 0;
}

C++: 
#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, dp[45];
    cin >> n;
    dp[0] = dp[1] = 1;
    for(int i = 2; i <= n; i++) {
        dp[i] = dp[i - 1] + dp[i - 2];
    }
    cout << dp[n] << endl;
}

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

int main()
{
	int n;
	scanf("%d", &n);
	std::vector<int64_t> table(n + 1, 1ll);
	for (int i{2}; i <= n; i++)
		table[i] = table[i - 1] + table[i - 2];
	printf("%lld\n", table[n]);

	return 0;
}

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

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

    int first = 1;
    int second = 1;
    
    for (int i = 2; i < input; ++i) {
        int third = first + second;
        first = second;
        second = third;
    }
    cout << second;
    
    return 0;
}

C++: #include<iostream>
int dp[1000000];
int main(){
	int n;
	std::cin>>n;
	dp[0]=1;
	dp[1]=1;
	for(int i=2;i<=n;i++){
		dp[i]=dp[i-1]+dp[i-2];
	}
	std::cout<<dp[n]<<"\n";
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <queue>
#include <unordered_map>

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
typedef long long ll;

using namespace std;

template<class T>
vector<T> make_vec(size_t a){
    return vector<T>(a);
}
template<class T, class... Ts>
auto make_vec(size_t a, Ts... ts){
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}

int main(){
    vector<ll> fib(50);
    rep(i, 50) {
        if(i == 0 || i == 1) {
            fib[i] = 1;
        } else {
            fib[i] = fib[i-1] + fib[i-2];
        }
    }
    int n; cin >> n;
    cout << fib[n] << endl;
}

C++: #include<stdio.h>
#include<cstdlib>

#define MAX 44

int fibonacci(int n){
  int i, F[MAX];
  F[0] = 1;
  F[1] = 1;
  for(i = 2; i < n+1; i++){
    F[i] = F[i-1] + F[i-2];
  }
  return F[i-1];
}

int main(){
  int n;
  scanf("%d", &n);

  printf("%d\n", fibonacci(n));
}

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

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

  // n???0???1?????£?????????????????????
  if(n <= 1){ cout << 1 << endl; }
  else{
    // n???2??\????????£??????dp??????
    vector<int> dp(n + 1);
    dp[0] = dp[1] = 1;
    for(int i = 2; i <= n; i++)
      dp[i] = dp[i - 1] + dp[i - 2];

    cout << n << endl;
  }

  return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

int feb(int n){
  int A[n];
  A[0]=A[1]=1;   
    if(n>=2){
      for (int i=2;i<=n;i++){
         A[i]= A[i-1]+A[i-2];
       }
    }
     return A[n];
  }

int main(void){
	int l;
  	cin>>l;
    cout<<feb(l)<<endl;
	return 0;
}

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


int a[50];
using namespace std;


int fibonacci(int n) {
	if (a[n] > 0)
		return a[n];

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


int main() {

	fill(a,a + 50, -1);

	int n;

	cin >> n;

	a[0] =  1;
	a[1] =  1;

	cout << fibonacci(n) << endl;

}

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

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

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

  return 0;
}

C++: #include <stdio.h>
int main(){
int a[50],n;
a[0]=a[1]=1;
scanf("%d",&n);
for(int i=2;i<=n;i++)
a[i]=a[i-1]+a[i-2];
printf("%d\n",a[n]);
}

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 <iostream>

using namespace std;

int cache[45];

int fibonacci(int n) {
    if (cache[n] != -1) {
        return cache[n];
    } else {
        int ret = fibonacci(n - 1) + fibonacci(n - 2);
        cache[n] = ret;
        return ret;
    }
}

int main() {
    for (int i = 0; i < 45; ++i)
        cache[i] = -1;
    cache[0] = cache[1] = 1;

    int n;
    cin >> n;
    cout << fibonacci(n) << '\n';
}

C++: #include<iostream>

using namespace std;

int fib(int n);

int memo[1000];

int main() {
  int n;

  //入力
  cin >> n;

  //出力
  cout << fib(n) << endl;

  return 0;
}

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