斐波那契系数
在数学中,斐波那契系数或斐波那契二项式系数定义为
其中n和k是非负整数,0≤k≤n,F j是第j个斐波那契数,n! F是第n个Fibonorial,其中0! F是空产品,其值为1。
斐波那契系数都是整数。一些特殊的值是:
斐波那契三角形
斐波那契系数类似于二项式系数,可以显示为类似于Pascal三角形的三角形。前八行如下所示。
斐波那契三角形的递归关系:
给定正整数n 。任务是打印高度为n(或n + 1行)的斐波那契三角形。
例子:
Input : n = 6
Output :
1
1 1
1 1 1
1 2 2 1
1 3 6 3 1
1 5 15 15 5 1
1 8 40 60 40 8 1
Input : n = 5
Output :
1
1 1
1 1 1
1 2 2 1
1 3 6 3 1
1 5 15 15 5 1
下面是打印高度为n的斐波那契三角形的实现:
C++
// CPP Program to print Fibonomial Triangle of height n.
#include
#define N 6
using namespace std;
// Function to produce Fibonacci Series.
void fib(int f[], int n)
{
int i;
/* 0th and 1st number of the series are 0 and 1*/
f[0] = 0;
f[1] = 1;
for (i = 2; i <= n; i++)
/* Add the previous 2 numbers in the series
and store it */
f[i] = f[i-1] + f[i-2];
}
// Function to produce fibonomial coefficient
void fibcoef(int fc[][N+1], int f[], int n)
{
for (int i = 0; i <= n; i++)
fc[i][0] = 1;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
int k = j;
while(k--)
fc[i][j] *= f[k];
k = 1;
while((j+1)!=k)
fc[i][j] /= f[k++];
}
}
}
// Function to print Fibonomial Triangle.
void printFibonomialTriangle(int n)
{
int f[N+1] = { 0 };
// Finding the fibonacci series.
fib(f, n);
// to store triangle value.
int dp[N+1][N+1] = { 0 };
// initalising the 0th element of each row
// and diagonal element equal to 0.
for (int i = 0; i <= n; i++)
dp[i][0] = dp[i][i] = 1;
// for each row.
for (int i = 1; i <= n; i++)
{
// for each column.
for (int j = 1; j < i; j++)
// finding each element using recurrence
// relation.
dp[i][j] = f[i-j+1]*dp[i-1][j-1] +
f[j-1]*dp[i-1][j];
}
// printing the Fibonomial Triangle.
for (int i = 0; i <= n; i++)
{
for (int j = 0; j <= i; j++)
cout << dp[i][j] << " ";
cout << endl;
}
}
// Driven Program
int main()
{
int n = 6;
printFibonomialTriangle(n);
return 0;
}
Java
// Java Program to print Fibonomial
// Triangle of height n.
class GFG
{
static final int N=6;
// Function to produce Fibonacci Series.
static void fib(int f[], int n)
{
int i;
/* 0th and 1st number of
the series are 0 and 1*/
f[0] = 0;
f[1] = 1;
for (i = 2; i <= n; i++)
/* Add the previous 2 numbers in
the series and store it */
f[i] = f[i-1] + f[i-2];
}
// Function to produce fibonomial coefficient
static void fibcoef(int fc[][], int f[], int n)
{
for (int i = 0; i <= n; i++)
fc[i][0] = 1;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
int k = j;
while(k > 0)
{
k--;
fc[i][j] *= f[k];
}
k = 1;
while((j + 1) != k)
fc[i][j] /= f[k++];
}
}
}
// Function to print Fibonomial Triangle.
static void printFibonomialTriangle(int n)
{
int f[] = new int[N+1];
// Finding the fibonacci series.
fib(f, n);
// to store triangle value.
int dp[][] = new int[N + 1][N + 1];
// initalising the 0th element of each row
// and diagonal element equal to 0.
for (int i = 0; i <= n; i++)
dp[i][0] = dp[i][i] = 1;
// for each row.
for (int i = 1; i <= n; i++)
{
// for each column.
for (int j = 1; j < i; j++)
// finding each element using recurrence
// relation.
dp[i][j] = f[i - j + 1] * dp[i - 1][j - 1] +
f[j-1]*dp[i-1][j];
}
// printing the Fibonomial Triangle.
for (int i = 0; i <= n; i++)
{
for (int j = 0; j <= i; j++)
System.out.print(dp[i][j] + " ");
System.out.println();
}
}
// Driver code
public static void main (String[] args)
{
int n = 6;
printFibonomialTriangle(n);
}
}
// This code is contributed by Anant Agarwal.
Python3
# Python3 Program to print Fibonomial
# Triangle of height n.
N = 6;
# Function to produce Fibonacci Series.
def fib(f, n):
# 0th and 1st number of the
# series are 0 and 1
f[0] = 0;
f[1] = 1;
for i in range(2, n + 1):
# Add the previous 2 numbers in
# the series and store it
f[i] = f[i - 1] + f[i - 2];
# Function to produce fibonomial
# coefficient
def fibcoef(fc, f, n):
for i in range(n + 1):
fc[i][0] = 1;
for i in range(1, n + 1):
for j in range(1, i + 1):
k = j;
while(k > 0):
k -= 1;
fc[i][j] *= f[k];
k = 1;
while((j + 1) != k):
fc[i][j] /= f[k];
k += 1;
# Function to print Fibonomial Triangle.
def printFibonomialTriangle(n):
f = [0] * (N + 1);
# Finding the fibonacci series.
fib(f, n);
# to store triangle value.
dp = [[0 for x in range(N + 1)]
for y in range(N + 1)];
# initalising the 0th element of each
# row and diagonal element equal to 0.
for i in range(n + 1):
dp[i][0] = 1;
dp[i][i] = 1;
# for each row.
for i in range(1, n + 1):
# for each column.
for j in range(1, i):
# finding each element using
# recurrence relation.
dp[i][j] = (f[i - j + 1] * dp[i - 1][j - 1] +
f[j - 1] * dp[i - 1][j]);
# printing the Fibonomial Triangle.
for i in range(n + 1):
for j in range(i + 1):
print(dp[i][j], end = " ");
print("");
# Driver Code
n = 6;
printFibonomialTriangle(n);
# This code is contributed by mits
C#
// C# Program to print Fibonomial
// Triangle of height n.
using System;
class GFG
{
static int N = 6;
// Function to produce Fibonacci Series.
static void fib(int []f, int n)
{
int i;
/* 0th and 1st number of
the series are 0 and 1*/
f[0] = 0;
f[1] = 1;
for (i = 2; i <= n; i++)
/* Add the previous 2 numbers in
the series and store it */
f[i] = f[i - 1] + f[i - 2];
}
// Function to produce fibonomial coefficient
static void fibcoef(int [,]fc, int []f, int n)
{
for (int i = 0; i <= n; i++)
fc[i,0] = 1;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
int k = j;
while(k > 0)
{
k--;
fc[i, j] *= f[k];
}
k = 1;
while((j + 1) != k)
fc[i, j] /= f[k++];
}
}
}
// Function to print Fibonomial Triangle.
static void printFibonomialTriangle(int n)
{
int []f = new int[N + 1];
// Finding the fibonacci series.
fib(f, n);
// to store triangle value.
int [,]dp = new int[N + 1, N + 1];
// initalising the 0th element of each row
// and diagonal element equal to 0.
for (int i = 0; i <= n; i++)
dp[i, 0] = dp[i, i] = 1;
// for each row.
for (int i = 1; i <= n; i++)
{
// for each column.
for (int j = 1; j < i; j++)
// finding each element using recurrence
// relation.
dp[i,j] = f[i - j + 1] * dp[i - 1,j - 1] +
f[j - 1] * dp[i - 1, j];
}
// printing the Fibonomial Triangle.
for (int i = 0; i <= n; i++)
{
for (int j = 0; j <= i; j++)
Console.Write(dp[i,j] + " ");
Console.WriteLine();
}
}
// Driver code
public static void Main ()
{
int n = 6;
printFibonomialTriangle(n);
}
}
// This code is contributed by Vt_m.
PHP
输出:
1
1 1
1 1 1
1 2 2 1
1 3 6 3 1
1 5 15 15 5 1
1 8 40 60 40 8 1