{ "data": { "question": { "questionId": "2348", "questionFrontendId": "2266", "categoryTitle": "Algorithms", "boundTopicId": 1470054, "title": "Count Number of Texts", "titleSlug": "count-number-of-texts", "content": "

Alice is texting Bob using her phone. The mapping of digits to letters is shown in the figure below.

\n\"\"\n

In order to add a letter, Alice has to press the key of the corresponding digit i times, where i is the position of the letter in the key.

\n\n\n\n

However, due to an error in transmission, Bob did not receive Alice's text message but received a string of pressed keys instead.

\n\n\n\n

Given a string pressedKeys representing the string received by Bob, return the total number of possible text messages Alice could have sent.

\n\n

Since the answer may be very large, return it modulo 109 + 7.

\n\n

 

\n

Example 1:

\n\n
\nInput: pressedKeys = "22233"\nOutput: 8\nExplanation:\nThe possible text messages Alice could have sent are:\n"aaadd", "abdd", "badd", "cdd", "aaae", "abe", "bae", and "ce".\nSince there are 8 possible messages, we return 8.\n
\n\n

Example 2:

\n\n
\nInput: pressedKeys = "222222222222222222222222222222222222"\nOutput: 82876089\nExplanation:\nThere are 2082876103 possible text messages Alice could have sent.\nSince we need to return the answer modulo 109 + 7, we return 2082876103 % (109 + 7) = 82876089.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "统计打字方案数", "translatedContent": "

Alice 在给 Bob 用手机打字。数字到字母的 对应 如下图所示。

\n\n

\"\"

\n\n

为了 打出 一个字母，Alice 需要 按 对应字母 i 次，i 是该字母在这个按键上所处的位置。

\n\n\n\n

但是，由于传输的错误，Bob 没有收到 Alice 打字的字母信息，反而收到了 按键的字符串信息 。

\n\n\n\n

给你一个字符串 pressedKeys ，表示 Bob 收到的字符串，请你返回 Alice 总共可能发出多少种文字信息 。

\n\n

由于答案可能很大，将它对 109 + 7 取余 后返回。

\n\n

 

\n\n

示例 1：

\n\n
输入：pressedKeys = \"22233\"\n输出：8\n解释：\nAlice 可能发出的文字信息包括：\n\"aaadd\", \"abdd\", \"badd\", \"cdd\", \"aaae\", \"abe\", \"bae\" 和 \"ce\" 。\n由于总共有 8 种可能的信息，所以我们返回 8 。\n
\n\n

示例 2：

\n\n
输入：pressedKeys = \"222222222222222222222222222222222222\"\n输出：82876089\n解释：\n总共有 2082876103 种 Alice 可能发出的文字信息。\n由于我们需要将答案对 109 + 7 取余，所以我们返回 2082876103 % (109 + 7) = 82876089 。\n
\n\n

 

\n\n

提示：

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