Program to print Reverse Floyd’s triangle

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Floyd’s triangle is a triangle with first natural numbers. Task is to print reverse of Floyd’s triangle.
Examples:

Input : 4
Output :
10 9 8 7
6 5 4 
3 2 
1 

Input : 5
Output :
15 14 13 12 11 
10 9 8 7 
6 5 4 
3 2 
1

C++

// CPP program to print reverse of 
// floyd's triangle 
#include <bits/stdc++.h> 
using namespace std; 
  
void printReverseFloyd(int n) 
{ 
    int curr_val = n * (n + 1) / 2; 
    for (int i = n; i >= 1; i--) { 
        for (int j = i; j >= 1; j--) { 
            cout << setprecision(2); 
            cout << curr_val-- << "  "; 
        } 
  
        cout << endl; 
    } 
} 
  
// Driver's Code 
int main() 
{ 
    int n = 7; 
    printReverseFloyd(n); 
    return 0; 
} 
  
// this article is contributed by manish kumar rai 

Java

// Java program to print reverse of 
// floyd's triangle 
import java.io.*; 
  
class GFG { 
    static void printReverseFloyd(int n) 
    { 
        int curr_val = n * (n + 1) / 2; 
        for (int i = n; i >= 1; i--) { 
            for (int j = i; j >= 1; j--) { 
                System.out.printf("%2d  ", curr_val--); 
            } 
  
            System.out.println(""); 
        } 
    } 
  
    // Driver method 
    public static void main(String[] args) 
    { 
        int n = 7; 
        printReverseFloyd(n); 
    } 
} 
// this article is contributed by manish kumar rai 

Python3

# Python3 program to print reverse of  
# floyd's triangle 
def printReverseFloyd(n): 
  
    curr_val = int(n*(n + 1)/2) 
    for i in range(n + 1, 1, -1): 
        for j in range(i, 1, -1): 
            print(curr_val, end ="  ") 
            curr_val -= 1
          
        print("") 
          
# Driver code 
n = 7
printReverseFloyd(n) 

C#

// C# program to print reverse  
// of floyd's triangle 
using System; 
using System.Globalization; 
  
class GFG 
{ 
    static void printReverseFloyd(int n) 
    { 
        int curr_val = n * (n + 1) / 2; 
        for (int i = n; i >= 1; i--) 
        { 
            for (int j = i; j >= 1; j--)  
            { 
                Console.Write(curr_val-- + " "); 
            } 
  
            Console.WriteLine(""); 
        } 
    } 
      
    // Driver Code 
    public static void Main() 
    { 
        int n = 7; 
        printReverseFloyd(n); 
    } 
      
} 
  
// This code is contributed by Sam007 

PHP

<?php 
// PHP program to print reverse  
// of floyd's triangle  
function printReverseFloyd($n)  
{  
    $curr_val = $n * ($n + 1) / 2;  
    for ($i = $n; $i >= 1; $i--)  
    {  
        for ( $j = $i; $j >= 1; $j--)  
        {  
            echo $curr_val-- , " ";  
        }  
  
        echo " \n";  
    }  
}  
  
// Driver Code  
$n = 7;  
printReverseFloyd($n);  
  
// This code is contributed by ajit  
?> 

Javascript

<script> 
  
// Javascript program to print reverse of 
// floyd's triangle 
  
function printReverseFloyd(n) 
    { 
        let curr_val = n * (n + 1) / 2; 
        for (let i = n; i >= 1; i--) { 
            for (let j = i; j >= 1; j--) { 
                document.write(curr_val-- + " "); 
            } 
    
            document.write("<br/>"); 
        } 
    } 
  
  
// Driver Code 
  
          let n = 7; 
        printReverseFloyd(n); 
      
</script> 

Output:

28  27  26  25  24  23  22  
21  20  19  18  17  16  
15  14  13  12  11  
10  9  8  7  
6  5  4  
3  2  
1

Time complexity: O(n²) for given input n

Auxiliary space: O(1)

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