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g2401_2500.s2437_number_of_valid_clock_times.readme.md Maven / Gradle / Ivy

2437\. Number of Valid Clock Times

Easy

You are given a string of length `5` called `time`, representing the current time on a digital clock in the format `"hh:mm"`. The **earliest** possible time is `"00:00"` and the **latest** possible time is `"23:59"`.

In the string `time`, the digits represented by the `?` symbol are **unknown**, and must be **replaced** with a digit from `0` to `9`.

Return _an integer_ `answer`_, the number of valid clock times that can be created by replacing every_ `?`_with a digit from_ `0` _to_ `9`.

**Example 1:**

**Input:** time = "?5:00"

**Output:** 2

**Explanation:** We can replace the ? with either a 0 or 1, producing "05:00" or "15:00". Note that we cannot replace it with a 2, since the time "25:00" is invalid. In total, we have two choices.

**Example 2:**

**Input:** time = "0?:0?"

**Output:** 100

**Explanation:** Each ? can be replaced by any digit from 0 to 9, so we have 100 total choices.

**Example 3:**

**Input:** time = "??:??"

**Output:** 1440

**Explanation:** There are 24 possible choices for the hours, and 60 possible choices for the minutes. In total, we have 24 \* 60 = 1440 choices.

**Constraints:**

*   `time` is a valid string of length `5` in the format `"hh:mm"`.
*   `"00" <= hh <= "23"`
*   `"00" <= mm <= "59"`
*   Some of the digits might be replaced with `'?'` and need to be replaced with digits from `0` to `9`.