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())
}

Python: # -*- coding: utf_8 -*-

n = int(input()) + 1
arr = [-1] * n

arr[0] = 1
arr[1] = 1

for i in range(2, len(arr)):
    arr[i] = arr[i - 1] + arr[i - 2]

print(arr[n - 1])

Python: import sys
sys.setrecursionlimit(10**7)

# n = int(input())
# a, b = map(int, input().split())
# int_list = list(map(int, input().split()))
# l = list(input().split())

mem = {}

def fib(n):
    if n == 0:
        return 1
    if n == 1:
        return 1
    if n not in mem.keys():
        res = fib(n-1) + fib(n-2)
        mem[n] = res
        return res
    else:
        return mem[n]

def solve():
    n = int(input())
    print(fib(n))

solve()

Python: n=int(input())
a=1
b=1
i=0
while i<n:
    a,b=b,a+b
    i+=1
print(a)

Python: a=1
b=1
c=[]
n=int(input())
c.append(a)
c.append(b)
for i in range(n):
  c.append(a+b)
  d=b
  b+=a
  a=d
print(c[n])

Python: def fib_memo(n):
    memo = [0] * (n + 1)

    def _fib(n):
        if n <= 1:
            return 1
        if memo[n] != 0:
            return memo[n]
        memo[n] = _fib(n-1) + _fib(n-2)
        return memo[n]

    return _fib(n)

N = int(input())
print(fib_memo(N))

Python: def main():
    N = int(input())
    if N <= 1:
        print(1)
        return
    fib = [0]*(N+1)
    fib[0], fib[1] = 1, 1
    for i in range(2, N+1):
        fib[i] = fib[i-1] + fib[i-2]
    print(fib[N])


if __name__ == "__main__":
    main()

Python: n=int(input())
a=[]
a.append(1)
a.append(1)

mamo =[-1]*100

for i in range(2,n+1):
	a.append(a[i-1]+a[i-2])
	i+=1
	# if mamo[i]!=-1
	

print(a[n])

Python: n=int(input())
def func(n):
    fib=[1,1]
    for i in range(2,n):
        fib.append(fib[i-2]+fib[i-1])
    return fib[n-1]
print(func(n+1))

Python: def fib(n):
    F = {0:1, 1:1}
    def fibonacci(n):
        ans = F.get(n,-1)
        if ans > 0: return ans
        F[n] = fibonacci(n-1) + fibonacci(n-2)
        return F[n]
    return fibonacci(n)
        
if __name__=='__main__':
    print(fib(int(input())))

Python: n = int(input().strip())
if n <= 1:
    print(1)
    raise SystemExit
prev1 = 1
prev2 = 1
for i in range(2, n+1):
    fib = prev2 + prev1
    prev2, prev1 = prev1, fib
print(fib)

Python: a=1
b=1
c=[]
n=int(input())
c.append(a)
c.append(b)
for i in range(n):
  c.append(a+b)
  d=b
  b+=a
  a=d
print(c[n])

Python: def fib2(n):
    a1, a2 = 1, 0
    while n > 0:
        a1, a2 = a1 + a2, a1
        n -= 1
    return a1


n = int(input())

print(fib2(n))

Python: class Fibonacci(object):
    memo = [1, 1]

    def get_nth(self, n):
        if n < len(Fibonacci.memo):
            return Fibonacci.memo[n]
        # print('fib({0}) not found'.format(n))
        for i in range(len(Fibonacci.memo), n+1):
            result = Fibonacci.memo[i-1] + Fibonacci.memo[i-2]
            Fibonacci.memo.append(result)
            # print('fib({0})={1} append'.format(i, result))
        return Fibonacci.memo[n]


if __name__ == '__main__':
    # ??????????????\???
    num = int(input())

    # ?????£??????????????°????¨????
    f = Fibonacci()
    result = f.get_nth(num)

    # ???????????????
    print('{0}'.format(result))

Python: def fib(n):
    if n==0 or n==1:
        return 1
    else:
        if f[n]!=0:
            return f[n]
        else:
            f[n]=fib(n-1)+fib(n-2)
            return f[n]
f=[0]*45
n=int(input())

print(fib(n))

Python: n = int(input())

memo = [0 for _ in range(45)]

def fib_memo(n):
    if memo[n] != 0:
        return memo[n]
    elif (n == 0) or (n == 1):
        return 1
    else:
        memo[n] = fib_memo(n-1) + fib_memo(n-2)
        return memo[n]
    
print(fib_memo(n))

Python: # Algorithms and Data Structures 1
# Fibonacci Numbers
# Name: Ryuya Asada
# ID: s1260064


def fibonacci(n) -> int:
    a = 0
    b = 1
    c = 0
    for i in range(1, n+1):
        c = a + b
        a = b
        b = c
    
    return c


def main():
    n = int(input())
    print(fibonacci(n))
    pass


if __name__ == "__main__":
    main()

Python: def fibonacci(n):
    if n == 0 or n == 1:
        return 1
    else:
        return fibonacci(n - 1) + fibonacci(n - 2)
        

print(fibonacci(int(input())))

Python: n = int(input())
dp = [0]*(n+1)
for i in range(n+1):
    if i == 0:
        dp[i] = 1
    elif i == 1:
        dp[i] = 1
    else:
        dp[i] = dp[i-1] + dp[i-2]
print(dp[n])

Python: n = int(input())
fib = [1, 1]
for i in range(n):
    fib[i] = fib[i-1] + fib[i-2]
print(fib[n])

Python: import sys

input = sys.stdin.readline


def main():
    n = int(input())

    fib = [1] * 46
    for i in range(2, 46):
        fib[i] = fib[i - 1] + fib[i - 2]

    ans = fib[n]
    print(ans)


if __name__ == "__main__":
    main()

Python: import sys
read = sys.stdin.read
readline = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 8)
INF = float('inf')
MOD = 10 ** 9 + 7


def main():
    N = int(readline())
    dp = [0] * 47
    dp[0] = 1
    dp[1] = 1
    for i in range(2,N+1):
        dp[i] = dp[i-1] + dp[i-2]
    print(dp[N])



if __name__ == '__main__':
    main()

Python: MAX = 10**5
fib = [0]*MAX

def fibonacci(n):
    if fib[n]:
        return fib[n]
    if n == 0 or n == 1:
        return 1
    
    fib[n] = fibonacci(n-1)+fibonacci(n-2)
    return fib[n]

N = int(input())
print(fibonacci(N))

Python: from functools import lru_cache

@lru_cache()
def fib(n:int):
    if n == 0 or n == 1:
        return 1
    else:
        return fib(n-1) + fib(n-2)

n = int(input())
print(fib(n))

Python: N = int(input())
fib = [1,1]
for i in range(2, N + 1):
    fib.append(fib[i - 1] + fib[i - 2])
print(fib[N])

Python: def fib(n):
    if n == 0:
        return 1
    elif n == 1:
        return 1

    return fib(n - 1) + fib(n - 2)

n = int(input())
print(fib(n))

Python: n = int(input())

dp = [0 for _ in range(45)]

def fib_dp(n):
    dp[0] = 1
    dp[1] = 1
    for i in range(2, n+1):
        dp[i] = dp[i-1] + dp[i-2]
    return dp[n]
       
print(fib_dp(n))

Python: n = int(input())
a=b=1
while n:
    a,b=b,a+b
    n-=1
print(a)

Python: f = [1, 1] + [0] * (int(input()) - 1)
for i in range(2, len(f)):f[i] = f[i - 2] + f[i - 1]
print(f[-1])

Python: n = int(input())
from functools import lru_cache

@lru_cache(maxsize=1000)
def fibo(n):
    if n < 2:
        return 1
    return fibo(n-1) + fibo(n-2)

print(fibo(n))

Python: class Fib:
    def __init__(self):
        self.memo = {0: 1, 1: 1}
    
    def calc_fib(self, n):
        if n in self.memo.keys():
            return self.memo[n]
        
        self.memo[n] = self.calc_fib(n - 2) + self.calc_fib(n - 1)
        return self.memo[n]
    
fib = Fib()
print(fib.calc_fib(int(input())))

Python: n = int(input())
print(round((pow((1+math.sqrt(5))/2,n) - pow((1-math.sqrt(5))/2,n)) / math.sqrt(5)))

Python: #!/usr/bin/python

n = int(input())

def fib(n):
    l = [0] * (n+1)
    l[0] = 1
    l[1] = 1

    for i in range(2, n+1):
        l[i] = l[i-1] + l[i-2]

    return l[i]

print(fib(n))

Python: a=1
b=1
list=[]
n=int(input())
list.append(a)
list.append(b)
for i in range(n):
    list.append(a+b)
    c=b
    b+=a
    a=c
print(list[n])

Python: a=[0]*45

def Fib(n):
    if n == 0:
        a[0]=1
        return 1
    elif n == 1:
        a[1]=1
        return 1
    else:
        if a[n]==0:
            a[n]=Fib(n-1)+Fib(n-2)
            return a[n]
        else:
            return a[n]
    
n=int(input())
print(Fib(n))

Python: n=int(input())
def func(n):
    fibonacci = [1,2]
    for i in range(2,n):
        fibonacci.append(fibonacci[i-2]+fibonacci[i-1])
    return fibonacci[n-1]
print(func(n))