{ "data": { "question": { "questionId": "2528", "questionFrontendId": "2437", "categoryTitle": "Algorithms", "boundTopicId": 1891141, "title": "Number of Valid Clock Times", "titleSlug": "number-of-valid-clock-times", "content": "

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".

\n\n

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

\n\n

Return an integer answer, the number of valid clock times that can be created by replacing every ? with a digit from 0 to 9.

\n\n

 

\n

Example 1:

\n\n
\nInput: time = "?5:00"\nOutput: 2\nExplanation: 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.\n
\n\n

Example 2:

\n\n
\nInput: time = "0?:0?"\nOutput: 100\nExplanation: Each ? can be replaced by any digit from 0 to 9, so we have 100 total choices.\n
\n\n

Example 3:

\n\n
\nInput: time = "??:??"\nOutput: 1440\nExplanation: There are 24 possible choices for the hours, and 60 possible choices for the minutes. In total, we have 24 * 60 = 1440 choices.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "有效时间的数目", "translatedContent": "

给你一个长度为 5 的字符串 time ，表示一个电子时钟当前的时间，格式为 \"hh:mm\" 。最早 可能的时间是 \"00:00\" ，最晚 可能的时间是 \"23:59\" 。

\n\n

在字符串 time 中，被字符 ? 替换掉的数位是 未知的 ，被替换的数字可能是 0 到 9 中的任何一个。

\n\n

请你返回一个整数 answer ，将每一个 ? 都用 0 到 9 中一个数字替换后，可以得到的有效时间的数目。

\n\n

 

\n\n

示例 1：

\n\n
输入：time = \"?5:00\"\n输出：2\n解释：我们可以将 ? 替换成 0 或 1 ，得到 \"05:00\" 或者 \"15:00\" 。注意我们不能替换成 2 ，因为时间 \"25:00\" 是无效时间。所以我们有两个选择。\n
\n\n

示例 2：

\n\n
输入：time = \"0?:0?\"\n输出：100\n解释：两个 ? 都可以被 0 到 9 之间的任意数字替换，所以我们总共有 100 种选择。\n
\n\n

示例 3：

\n\n
输入：time = \"??:??\"\n输出：1440\n解释：小时总共有 24 种选择，分钟总共有 60 种选择。所以总共有 24 * 60 = 1440 种选择。\n
\n\n

 

\n\n

提示：

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