斐波那契数列

def solve():
    import matplotlib.pyplot as plt
    def fibonacci(n):
        fib = [0, 1]
        for i in range(2, n):
            fib.append(fib[-1] + fib[-2])
        return fib
    n = 20
    fib = fibonacci(n)
    print(f"前{n}个斐波那契数: {fib}")
    plt.figure(figsize=(10, 6))
    plt.plot(range(n), fib, 'bo-', linewidth=2, markersize=8)
    plt.xlabel('n')
    plt.ylabel('F(n)')
    plt.title('斐波那契数列')
    plt.grid(True)
    plt.show()