Program to print the floyd triangle

Learn how to print the floyd triangle in javascript.

Floyd triangle is a way to print the numbers in following pattern

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

We will implement a simple algorithm to print the triangle.

Implementation

• We will use two different loops to print the each element on different rows.
• Also we will use a extra variable to keep track of the numbers count.

let floydTriangle = (rows) => {
   let k = 0;
  
   for(let i = 1; i <= rows; i++){
     
     let str = '';
     
     for(let j = 1; j <= i; j++){
       //Increment the no;
       k += 1;
       
       //Add the no for each row
       str += k + ' ' ;
     }
     
     //Print the numbers for each row
     console.log(str.trim());
   }
};

Input:
floydTriangle(5);

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

Time complexity: O(n ^ 2).
Space complexity: O(1).

Time and Space complexity

• We are using two nested loops to print the triangle, we are printing the count of numbers for each row like n * (n - 1) * (n - 2) ..., so Time complexity is O(n ^ 2).
• We are using constant space, so Space complexity is O(1).