leetcode-problemset/leetcode-cn/originData/Uh984O.json

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            "questionId": "1000138",
            "questionFrontendId": "LCP 25",
            "categoryTitle": "Algorithms",
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            "title": "古董键盘",
            "titleSlug": "Uh984O",
            "content": "English description is not available for the problem. Please switch to Chinese.",
            "translatedTitle": "古董键盘",
            "translatedContent": "小扣在秋日市集购买了一个古董键盘。由于古董键盘年久失修，键盘上只有 26 个字母 **a~z** 可以按下，且每个字母最多仅能被按 `k` 次。\n\n小扣随机按了 `n` 次按键，请返回小扣总共有可能按出多少种内容。由于数字较大，最终答案需要对 1000000007 (1e9 + 7) 取模。\n\n\n**示例 1：**\n>输入：`k = 1, n = 1`\n> \n>输出：`26`\n> \n>解释：由于只能按一次按键，所有可能的字符串为 \"a\", \"b\", ... \"z\" \n\n**示例 2：**\n>输入：`k = 1, n = 2`\n> \n>输出：`650`\n> \n>解释：由于只能按两次按键，且每个键最多只能按一次，所有可能的字符串（按字典序排序）为 \"ab\", \"ac\", ... \"zy\" \n\n**提示：**\n- `1 <= k <= 5`\n- `1 <= n <= 26*k`\n \n\n",
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            "difficulty": "Hard",
            "likes": 38,
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