Go: package main

import "fmt"

func fibonacci() func() int {
	x, y := 0, 1
	return func() int {
		x, y = y, x+y
		return x
	}
}
func main() {
	var n int

	fmt.Scan(&n)
	f := fibonacci()
	for i := 0; i < n; i++ {
		f()
	}
	fmt.Println(f())
}

C++: #include <iostream>

using namespace std;

int fib(int n);

int memo[45];

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);
}

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

int fib(int n) {
    if (n ==0 || n == 1) {
        return 1;
    }
    return fib(n-1) + fib(n - 2);
}
int main(void) {
    cin >> num;
    cout << fib(num) << endl;
    
    
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cassert>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define rep(i,n) FOR(i,0,n)
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define vint vector<int>
#define vdouble vector<double>
#define vstring vector<string>
using namespace std;

#include<map>
#include<set>
#include<queue>

typedef long long ll;
typedef unsigned long long ull;

const int MAX_N = 1000000;
ll mem[MAX_N];
int N;
int main() {

	int ret;
	cin >> N;
	mem[0] = 1;
	mem[1] = 1;
	rep(i, N+1){
		if (i >= 2) mem[i] = mem[i - 1] + mem[i - 2];
	}
	cout << mem[N] << endl;
}

C++: #include<stdio.h>
using namespace std;

int f[50]={1,1};

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

int main(){
    Fibonacci();
    int n;
    scanf("%d",&n);
    printf("%d\n",f[n]);
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define rep2(i,x,n) for(int i=x; i<(n); i++)
#define ALL(n) begin(n),end(n)
#define INF ((1<<30)-1)
#define LINF (1LL<<60)
#define EPS (1e-10)
typedef long long Int;
typedef pair<Int, Int> P;
typedef pair<int, int> pint;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n; cin>>n;
    vector<Int> dp(n+1,0);
    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 <iostream>
#include <iomanip>
#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <functional>
#include <sstream>
#include <string>
#include <utility>
#include <map>
#include <memory>
#include <set>
#include <vector>
#include <deque>
#include <list>
#include <stack>
#include <queue>
#include <array>

using namespace std;

class Fibonacci
{
public:
  array<int,45> f;
  int fib( int n );
  int init();
};

int Fibonacci::init()
{
  for ( auto& i : f )
    i = -1;

  f[0] = 1;
  f[1] = 1;

  return 0;
}

int Fibonacci::fib( int n )
{
  if ( f[n] > 0 )
    return f[n];

  int ret = fib( n - 1 ) + fib( n - 2 );
  f[n] = ret;

  return ret;
}

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

  Fibonacci f;

  f.init();
  cout << f.fib( n ) << endl;

  return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <cctype>
#include <climits>
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <list>
#include <queue>
#include <deque>
#include <algorithm>
#include <numeric>
#include <utility>
#include <complex>
#include <memory>
#include <functional>
 
using namespace std;
 
#define ALL(g) (g).begin(),(g).end()
#define REP(i, x, n) for(int i = x; i <= n; i++) //変数,初期値,終値
#define rep(i,n) REP(i,0,n)
#define F(i,j,k) fill(i[0],i[0]+j*j,k)
#define P(p) cout<<(p)<<endl;
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define INF 1<<25
#define pb push_back
 
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<double> vd;
typedef pair<int,int> pii;
typedef pair<long,long> pll;
typedef long long ll;

int main(void)
{
    int n,i;
    int ans=0;
    int dp[44] = {1,1};
    cin >> n;
    i=n;
    REP(i,2,n){
        dp[i] = dp[i-1] + dp[i - 2];
    }
    cout << dp[i] << endl;
    
    return 0;
}

C++: #include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <cmath>
#include <cstdlib>
using namespace std;

const int MAX = 55;
int n;
int dp[MAX];

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

int main() {
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);
    memset(dp, -1, sizeof(dp));
    dp[0] = 1;
    dp[1] = 1;
    scanf("%d", &n);
    printf("%d\n", solve(n));
    return 0;
}

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

const int MAX = 44;
int F[MAX];

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

C++: #include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <sstream>
#include <iomanip>
#include <cmath>
#include <string>
#include <cstdio>
#include <queue>
#include <list>
using namespace std;

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

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

  cout << fibonacci(n) << endl;

  return 0;
}

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

using namespace std;

long long fib[45];

int main(void) {

    int n;
    cin >> n;

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

    printf("%lld\n", fib[n]);

    return 0;
}

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

const int MAX_N = 44;

int main() {
    vector<int> fib(MAX_N + 1);
    fib[0] = 1;
    fib[1] = 1;
    for(int i = 2; i <= MAX_N; i++) fib[i] = fib[i - 1] + fib[i - 2];
    int N; cin >> N;
    cout << fib[N] << endl;
}

C++: #include <iostream>
using namespace std;
#define MAX 44

int F[MAX];

void Fibonacci(){
  F[0] = 0; F[1] = 1;
  for( int i = 2 ; i < MAX ; i++ ) F[i] = F[i-2] + F[i-1];
}

int main(void){
  Fibonacci();
  int i;

  cin >> i;
  cout << F[i] << endl;

  return 0;
}

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

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

C++: #include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
#define NIL -2000000001
#define MAX 2000

int A[MAX];
int n = 0;

int fib(int num) {
  if (A[num] != NIL) {
    return A[num];
  } else {
    return fib(num-1)+fib(num-2);
  }
}

int main() {
  int num;
  for ( int i = 0; i < MAX; i++ ) {
    A[i] = NIL;
  }
  A[0] = 1;
  A[1] = 1;
  scanf("%d", &num);
  printf("%d\n", fib(num));
  return 0;
}

C++: #include <bits/stdc++.h>
       
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

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

  vector<int> fib(n + 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 n;
int F[45];
int fibo(int i) {
    if (F[i]) {
        return F[i];
    }
    return fibo(i - 1) + fibo(i-2);
}

int main() {
    cin >> n;
    F[0] = F[1] = 1;
    cout << fibo(n) << endl;

    return 0;
}