// Function to generate and print the alphabet rangoli of size N
function printAlphabetRangoli(n: number): void {
if (n <= 0) return;
// Total width of the grid based on character and hyphen spacing
const totalWidth: number = 4 * n - 3;
// Loop from -(n-1) to (n-1) to handle top/bottom symmetry mathematically
for (let i: number = -(n - 1); i <= (n - 1); i++) {
const currentRowDist: number = Math.abs(i); // Distance from the center row
let lineChars: string = "";
// 1. Build the left/descending side of characters (e.g., e -> d -> c)
for (let j: number = 0; j < n - currentRowDist; j++) {
const ch: string = String.fromCharCode("a".charCodeAt(0) + n - 1 - j);
lineChars += ch;
}
// 2. Build the right/ascending side of characters (e.g., d -> e)
for (let j: number = n - currentRowDist - 2; j >= 0; j--) {
const ch: string = String.fromCharCode("a".charCodeAt(0) + n - 1 - j);
lineChars += ch;
}
// 3. Insert hyphens between characters
let standardRow: string = "";
for (let k: number = 0; k < lineChars.length; k++) {
standardRow += lineChars[k];
if (k !== lineChars.length - 1) {
standardRow += "-";
}
}
// 4. Calculate necessary hyphen padding for centering
const totalPadding: number = totalWidth - standardRow.length;
const sideHyphens: string = "-".repeat(totalPadding / 2);
// 5. Print the complete constructed row
console.log(sideHyphens + standardRow + sideHyphens);
}
}
// Usage
const n: number = 5;
printAlphabetRangoli(n);
/*
run:
--------e--------
------e-d-e------
----e-d-c-d-e----
--e-d-c-b-c-d-e--
e-d-c-b-a-b-c-d-e
--e-d-c-b-c-d-e--
----e-d-c-d-e----
------e-d-e------
--------e--------
*/
