mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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189 lines
19 KiB
JSON
189 lines
19 KiB
JSON
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"title": "Lexicographically Smallest Equivalent String",
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"content": "<p>You are given two strings of the same length <code>s1</code> and <code>s2</code> and a string <code>baseStr</code>.</p>\n\n<p>We say <code>s1[i]</code> and <code>s2[i]</code> are equivalent characters.</p>\n\n<ul>\n\t<li>For example, if <code>s1 = "abc"</code> and <code>s2 = "cde"</code>, then we have <code>'a' == 'c'</code>, <code>'b' == 'd'</code>, and <code>'c' == 'e'</code>.</li>\n</ul>\n\n<p>Equivalent characters follow the usual rules of any equivalence relation:</p>\n\n<ul>\n\t<li><strong>Reflexivity:</strong> <code>'a' == 'a'</code>.</li>\n\t<li><strong>Symmetry:</strong> <code>'a' == 'b'</code> implies <code>'b' == 'a'</code>.</li>\n\t<li><strong>Transitivity:</strong> <code>'a' == 'b'</code> and <code>'b' == 'c'</code> implies <code>'a' == 'c'</code>.</li>\n</ul>\n\n<p>For example, given the equivalency information from <code>s1 = "abc"</code> and <code>s2 = "cde"</code>, <code>"acd"</code> and <code>"aab"</code> are equivalent strings of <code>baseStr = "eed"</code>, and <code>"aab"</code> is the lexicographically smallest equivalent string of <code>baseStr</code>.</p>\n\n<p>Return <em>the lexicographically smallest equivalent string of </em><code>baseStr</code><em> by using the equivalency information from </em><code>s1</code><em> and </em><code>s2</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s1 = "parker", s2 = "morris", baseStr = "parser"\n<strong>Output:</strong> "makkek"\n<strong>Explanation:</strong> Based on the equivalency information in s1 and s2, we can group their characters as [m,p], [a,o], [k,r,s], [e,i].\nThe characters in each group are equivalent and sorted in lexicographical order.\nSo the answer is "makkek".\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s1 = "hello", s2 = "world", baseStr = "hold"\n<strong>Output:</strong> "hdld"\n<strong>Explanation: </strong>Based on the equivalency information in s1 and s2, we can group their characters as [h,w], [d,e,o], [l,r].\nSo only the second letter 'o' in baseStr is changed to 'd', the answer is "hdld".\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s1 = "leetcode", s2 = "programs", baseStr = "sourcecode"\n<strong>Output:</strong> "aauaaaaada"\n<strong>Explanation:</strong> We group the equivalent characters in s1 and s2 as [a,o,e,r,s,c], [l,p], [g,t] and [d,m], thus all letters in baseStr except 'u' and 'd' are transformed to 'a', the answer is "aauaaaaada".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s1.length, s2.length, baseStr <= 1000</code></li>\n\t<li><code>s1.length == s2.length</code></li>\n\t<li><code>s1</code>, <code>s2</code>, and <code>baseStr</code> consist of lowercase English letters.</li>\n</ul>\n",
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"code": "# @param {String} s1\n# @param {String} s2\n# @param {String} base_str\n# @return {String}\ndef smallest_equivalent_string(s1, s2, base_str)\n \nend",
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"Model these equalities as edges of a graph.",
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"Group each connected component of the graph and assign each node of this component to the node with the lowest lexicographically character.",
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"Finally convert the string with the precalculated information."
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