Given two arrays of strings list1 and list2, find the common strings with the least index sum.
A common string is a string that appeared in both list1 and list2.
A common string with the least index sum is a common string such that if it appeared at list1[i] and list2[j] then i + j should be the minimum value among all the other common strings.
Return all the common strings with the least index sum. Return the answer in any order.
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Example 1:
\n\n\nInput: list1 = ["Shogun","Tapioca Express","Burger King","KFC"], list2 = ["Piatti","The Grill at Torrey Pines","Hungry Hunter Steakhouse","Shogun"]\nOutput: ["Shogun"]\nExplanation: The only common string is "Shogun".\n\n\n
Example 2:
\n\n\nInput: list1 = ["Shogun","Tapioca Express","Burger King","KFC"], list2 = ["KFC","Shogun","Burger King"]\nOutput: ["Shogun"]\nExplanation: The common string with the least index sum is "Shogun" with index sum = (0 + 1) = 1.\n\n\n
Example 3:
\n\n\nInput: list1 = ["happy","sad","good"], list2 = ["sad","happy","good"]\nOutput: ["sad","happy"]\nExplanation: There are three common strings:\n"happy" with index sum = (0 + 1) = 1.\n"sad" with index sum = (1 + 0) = 1.\n"good" with index sum = (2 + 2) = 4.\nThe strings with the least index sum are "sad" and "happy".\n\n\n
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Constraints:
\n\n1 <= list1.length, list2.length <= 10001 <= list1[i].length, list2[i].length <= 30list1[i] and list2[i] consist of spaces ' ' and English letters.list1 are unique.list2 are unique.list1 and list2.给定两个字符串数组 list1 和 list2，找到 索引和最小的公共字符串。
公共字符串 是同时出现在 list1 和 list2 中的字符串。
具有 最小索引和的公共字符串 是指，如果它在 list1[i] 和 list2[j] 中出现，那么 i + j 应该是所有其他 公共字符串 中的最小值。
返回所有 具有最小索引和的公共字符串。以 任何顺序 返回答案。
\n\n\n\n
示例 1:
\n\n\n输入: list1 = [\"Shogun\", \"Tapioca Express\", \"Burger King\", \"KFC\"]，list2 = [\"Piatti\", \"The Grill at Torrey Pines\", \"Hungry Hunter Steakhouse\", \"Shogun\"]\n输出: [\"Shogun\"]\n解释: 唯一的公共字符串是 “Shogun”。\n\n\n
示例 2:
\n\n\n输入:list1 = [\"Shogun\", \"Tapioca Express\", \"Burger King\", \"KFC\"]，list2 = [\"KFC\", \"Shogun\", \"Burger King\"]\n输出: [\"Shogun\"]\n解释: 具有最小索引和的公共字符串是 “Shogun”，它有最小的索引和 = (0 + 1) = 1。\n\n\n
示例 3：
\n\n\n输入：list1 = [\"happy\",\"sad\",\"good\"], list2 = [\"sad\",\"happy\",\"good\"]\n输出：[\"sad\",\"happy\"]\n解释：有三个公共字符串：\n\"happy\" 索引和 = (0 + 1) = 1.\n\"sad\" 索引和 = (1 + 0) = 1.\n\"good\" 索引和 = (2 + 2) = 4.\n最小索引和的字符串是 \"sad\" 和 \"happy\"。\n\n
\n\n
提示:
\n\n1 <= list1.length, list2.length <= 10001 <= list1[i].length, list2[i].length <= 30 list1[i] 和 list2[i] 由空格 ' ' 和英文字母组成。list1 的所有字符串都是 唯一 的。list2 中的所有字符串都是 唯一 的。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5df2\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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