mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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184 lines
26 KiB
JSON
184 lines
26 KiB
JSON
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"title": "Count the Number of Powerful Integers",
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"content": "<p>You are given three integers <code>start</code>, <code>finish</code>, and <code>limit</code>. You are also given a <strong>0-indexed</strong> string <code>s</code> representing a <strong>positive</strong> integer.</p>\n\n<p>A <strong>positive</strong> integer <code>x</code> is called <strong>powerful</strong> if it ends with <code>s</code> (in other words, <code>s</code> is a <strong>suffix</strong> of <code>x</code>) and each digit in <code>x</code> is at most <code>limit</code>.</p>\n\n<p>Return <em>the <strong>total</strong> number of powerful integers in the range</em> <code>[start..finish]</code>.</p>\n\n<p>A string <code>x</code> is a suffix of a string <code>y</code> if and only if <code>x</code> is a substring of <code>y</code> that starts from some index (<strong>including </strong><code>0</code>) in <code>y</code> and extends to the index <code>y.length - 1</code>. For example, <code>25</code> is a suffix of <code>5125</code> whereas <code>512</code> is not.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = 1, finish = 6000, limit = 4, s = "124"\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> The powerful integers in the range [1..6000] are 124, 1124, 2124, 3124, and, 4124. All these integers have each digit <= 4, and "124" as a suffix. Note that 5124 is not a powerful integer because the first digit is 5 which is greater than 4.\nIt can be shown that there are only 5 powerful integers in this range.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = 15, finish = 215, limit = 6, s = "10"\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The powerful integers in the range [15..215] are 110 and 210. All these integers have each digit <= 6, and "10" as a suffix.\nIt can be shown that there are only 2 powerful integers in this range.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = 1000, finish = 2000, limit = 4, s = "3000"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> All integers in the range [1000..2000] are smaller than 3000, hence "3000" cannot be a suffix of any integer in this range.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= start <= finish <= 10<sup>15</sup></code></li>\n\t<li><code>1 <= limit <= 9</code></li>\n\t<li><code>1 <= s.length <= floor(log<sub>10</sub>(finish)) + 1</code></li>\n\t<li><code>s</code> only consists of numeric digits which are at most <code>limit</code>.</li>\n\t<li><code>s</code> does not have leading zeros.</li>\n</ul>\n",
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"translatedTitle": "统计强大整数的数目",
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"translatedContent": "<p>给你三个整数 <code>start</code> ,<code>finish</code> 和 <code>limit</code> 。同时给你一个下标从 <strong>0</strong> 开始的字符串 <code>s</code> ,表示一个 <strong>正</strong> 整数。</p>\n\n<p>如果一个 <strong>正</strong> 整数 <code>x</code> 末尾部分是 <code>s</code> (换句话说,<code>s</code> 是 <code>x</code> 的 <strong>后缀</strong>),且 <code>x</code> 中的每个数位至多是 <code>limit</code> ,那么我们称 <code>x</code> 是 <strong>强大的</strong> 。</p>\n\n<p>请你返回区间 <code>[start..finish]</code> 内强大整数的 <strong>总数目</strong> 。</p>\n\n<p>如果一个字符串 <code>x</code> 是 <code>y</code> 中某个下标开始(<strong>包括</strong> <code>0</code> ),到下标为 <code>y.length - 1</code> 结束的子字符串,那么我们称 <code>x</code> 是 <code>y</code> 的一个后缀。比方说,<code>25</code> 是 <code>5125</code> 的一个后缀,但不是 <code>512</code> 的后缀。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例 1:</strong></p>\n\n<pre>\n<b>输入:</b>start = 1, finish = 6000, limit = 4, s = \"124\"\n<b>输出:</b>5\n<b>解释:</b>区间 [1..6000] 内的强大数字为 124 ,1124 ,2124 ,3124 和 4124 。这些整数的各个数位都 <= 4 且 \"124\" 是它们的后缀。注意 5124 不是强大整数,因为第一个数位 5 大于 4 。\n这个区间内总共只有这 5 个强大整数。\n</pre>\n\n<p><strong class=\"example\">示例 2:</strong></p>\n\n<pre>\n<b>输入:</b>start = 15, finish = 215, limit = 6, s = \"10\"\n<b>输出:</b>2\n<b>解释:</b>区间 [15..215] 内的强大整数为 110 和 210 。这些整数的各个数位都 <= 6 且 \"10\" 是它们的后缀。\n这个区间总共只有这 2 个强大整数。\n</pre>\n\n<p><strong class=\"example\">示例 3:</strong></p>\n\n<pre>\n<b>输入:</b>start = 1000, finish = 2000, limit = 4, s = \"3000\"\n<b>输出:</b>0\n<b>解释:</b>区间 [1000..2000] 内的整数都小于 3000 ,所以 \"3000\" 不可能是这个区间内任何整数的后缀。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= start <= finish <= 10<sup>15</sup></code></li>\n\t<li><code>1 <= limit <= 9</code></li>\n\t<li><code>1 <= s.length <= floor(log<sub>10</sub>(finish)) + 1</code></li>\n\t<li><code>s</code> 数位中每个数字都小于等于 <code>limit</code> 。</li>\n\t<li><code>s</code> 不包含任何前导 0 。</li>\n</ul>\n",
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"We can use digit DP to count powerful integers in the range <code>[1, x]</code>.",
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"Let <code>dp[i][j]</code> be the number of integers that have <code>i</code> digits (with allowed leading 0s) and <code>j</code> refers to the comparison between the current number and the prefix of <code>x</code>, <code>j == 0</code> if the i-digit number formed currently is identical to the leftmost <code>i</code> digits of <code>x</code>, else if <code>j ==1</code> it means the i-digit number is smaller than the leftmost <code>i</code> digits of <code>x</code>.",
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