a, b, and c, your task is to find a string that has the minimum length and contains all three strings as substrings.\nIf there are multiple such strings, return the lexicographically smallest one.
\n\nReturn a string denoting the answer to the problem.
\n\nNotes
\n\na is lexicographically smaller than a string b (of the same length) if in the first position where a and b differ, string a has a letter that appears earlier in the alphabet than the corresponding letter in b.\n
Example 1:
\n\n\nInput: a = "abc", b = "bca", c = "aaa"\nOutput: "aaabca"\nExplanation: We show that "aaabca" contains all the given strings: a = ans[2...4], b = ans[3..5], c = ans[0..2]. It can be shown that the length of the resulting string would be at least 6 and "aaabca" is the lexicographically smallest one.\n\n
Example 2:
\n\n\nInput: a = "ab", b = "ba", c = "aba"\nOutput: "aba"\nExplanation: We show that the string "aba" contains all the given strings: a = ans[0..1], b = ans[1..2], c = ans[0..2]. Since the length of c is 3, the length of the resulting string would be at least 3. It can be shown that "aba" is the lexicographically smallest one.\n\n\n
\n
Constraints:
\n\n1 <= a.length, b.length, c.length <= 100a, b, c consist only of lowercase English letters.a ，b 和 c ， 你的任务是找到长度 最短 的字符串，且这三个字符串都是它的 子字符串 。\n如果有多个这样的字符串，请你返回 字典序最小 的一个。
\n\n请你返回满足题目要求的字符串。
\n\n注意：
\n\na 和 b ，如果在第一个不相同的字符处，a 的字母在字母表中比 b 的字母 靠前 ，那么字符串 a 比字符串 b 字典序小 。\n\n
示例 1：
\n\n\n\n输入：a= \"abc\",b= \"bca\",c= \"aaa\"\n输出：\"aaabca\"\n解释：字符串 \"aaabca\" 包含所有三个字符串：a = ans[2...4] ，b = ans[3..5] ，c = ans[0..2] 。结果字符串的长度至少为 6 ，且\"aaabca\" 是字典序最小的一个。
示例 2：
\n\n\n\n输入：a= \"ab\",b= \"ba\",c= \"aba\"\n输出：\"aba\"\n解释：字符串 \"aba\" 包含所有三个字符串：a = ans[0..1] ，b = ans[1..2] ，c = ans[0..2] 。由于 c 的长度为 3 ，结果字符串的长度至少为 3 。\"aba\" 是字典序最小的一个。\n
\n\n
提示：
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"editorType": "CKEDITOR",
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"style": "LEETCODE",
"exampleTestcases": "\"abc\"\n\"bca\"\n\"aaa\"\n\"ab\"\n\"ba\"\n\"aba\"",
"__typename": "QuestionNode"
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