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g2001_2100.s2073_time_needed_to_buy_tickets.readme.md Maven / Gradle / Ivy

2073\. Time Needed to Buy Tickets

Easy

There are `n` people in a line queuing to buy tickets, where the 0th person is at the **front** of the line and the (n - 1)th person is at the **back** of the line.

You are given a **0-indexed** integer array `tickets` of length `n` where the number of tickets that the ith person would like to buy is `tickets[i]`.

Each person takes **exactly 1 second** to buy a ticket. A person can only buy **1 ticket at a time** and has to go back to **the end** of the line (which happens **instantaneously**) in order to buy more tickets. If a person does not have any tickets left to buy, the person will **leave** the line.

Return _the **time taken** for the person at position_ `k`_**(0-indexed)** to finish buying tickets_.

**Example 1:**

**Input:** tickets = [2,3,2], k = 2

**Output:** 6

**Explanation:**

- In the first pass, everyone in the line buys a ticket and the line becomes [1, 2, 1].

- In the second pass, everyone in the line buys a ticket and the line becomes [0, 1, 0].

The person at position 2 has successfully bought 2 tickets and it took 3 + 3 = 6 seconds. 

**Example 2:**

**Input:** tickets = [5,1,1,1], k = 0

**Output:** 8

**Explanation:**

- In the first pass, everyone in the line buys a ticket and the line becomes [4, 0, 0, 0].

- In the next 4 passes, only the person in position 0 is buying tickets.

The person at position 0 has successfully bought 5 tickets and it took 4 + 1 + 1 + 1 + 1 = 8 seconds. 

**Constraints:**

*   `n == tickets.length`
*   `1 <= n <= 100`
*   `1 <= tickets[i] <= 100`
*   `0 <= k < n`