# 1904. The Number of Full Rounds You Have Played

https://leetcode.com/problems/the-number-of-full-rounds-you-have-played

## Description

A new online video game has been released, and in this video game, there are **15-minute** rounds scheduled every **quarter-hour** period. This means that at `HH:00`, `HH:15`, `HH:30` and `HH:45`, a new round starts, where `HH` represents an integer number from `00` to `23`. A **24-hour clock** is used, so the earliest time in the day is `00:00` and the latest is `23:59`.

Given two strings `startTime` and `finishTime` in the format `"HH:MM"` representing the exact time you **started** and **finished** playing the game, respectively, calculate the **number of full rounds** that you played during your game session.

* For example, if `startTime = "05:20"` and `finishTime = "05:59"` this means you played only one full round from `05:30` to `05:45`. You did not play the full round from `05:15` to `05:30` because you started after the round began, and you did not play the full round from `05:45` to `06:00` because you stopped before the round ended.

If `finishTime` is **earlier** than `startTime`, this means you have played overnight (from `startTime` to the midnight and from midnight to `finishTime`).

Return _the **number of full rounds** that you have played if you had started playing at_ `startTime` _and finished at_ `finishTime`.

**Example 1:**

```
**Input:** startTime = "12:01", finishTime = "12:44"
**Output:** 1
**Explanation:** You played one full round from 12:15 to 12:30.
You did not play the full round from 12:00 to 12:15 because you started playing at 12:01 after it began.
You did not play the full round from 12:30 to 12:45 because you stopped playing at 12:44 before it ended.
```

**Example 2:**

```
**Input:** startTime = "20:00", finishTime = "06:00"
**Output:** 40
**Explanation:** You played 16 full rounds from 20:00 to 00:00 and 24 full rounds from 00:00 to 06:00.
16 + 24 = 40.
```

**Example 3:**

```
**Input:** startTime = "00:00", finishTime = "23:59"
**Output:** 95
**Explanation:** You played 4 full rounds each hour except for the last hour where you played 3 full rounds.
```

**Constraints:**

* `startTime` and `finishTime` are in the format `HH:MM`.
* `00 <= HH <= 23`
* `00 <= MM <= 59`
* `startTime` and `finishTime` are not equal.

## ac

```java
```
