timeRequiredToBuy.js

/**
 * @param {number[]} tickets
 * @param {number} k
 * @return {number}
 */
var timeRequiredToBuy = function(tickets, k) {
    // Initialize a counter to keep track of the total time
    let count = 0;

    // Loop through the tickets array in a circular manner
    // The loop continues until the person at position k has no more tickets to buy
    for (let i = 0; tickets[k] > 0; i = (i + 1) % tickets.length) {
        // If the person at the current position has tickets to buy
        if (tickets[i] > 0) {
            // The person buys a ticket, decreasing their ticket count by 1
            tickets[i]--;
            // Increase the total counter by 1
            count++;
        }
    }

    // Return the total time taken for the person at position k to buy all their tickets
    return count;
};