![](\"https://assets.leetcode.com/uploads/2021/06/12/833-ex1.png\")
You are given a 0-indexed string s that you must perform k replacement operations on. The replacement operations are given as three 0-indexed parallel arrays, indices, sources, and targets, all of length k.
To complete the ith replacement operation:
sources[i] occurs at index indices[i] in the original string s.targets[i].For example, if s = "abcd", indices[i] = 0, sources[i] = "ab", and targets[i] = "eee", then the result of this replacement will be "eeecd".
All replacement operations must occur simultaneously, meaning the replacement operations should not affect the indexing of each other. The testcases will be generated such that the replacements will not overlap.
\n\ns = "abc", indices = [0, 1], and sources = ["ab","bc"] will not be generated because the "ab" and "bc" replacements overlap.Return the resulting string after performing all replacement operations on s.
A substring is a contiguous sequence of characters in a string.
\n\n\n
Example 1:
\n\n\nInput: s = "abcd", indices = [0, 2], sources = ["a", "cd"], targets = ["eee", "ffff"]\nOutput: "eeebffff"\nExplanation:\n"a" occurs at index 0 in s, so we replace it with "eee".\n"cd" occurs at index 2 in s, so we replace it with "ffff".\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/06/12/833-ex2-1.png\")
\n\nInput: s = "abcd", indices = [0, 2], sources = ["ab","ec"], targets = ["eee","ffff"]\nOutput: "eeecd"\nExplanation:\n"ab" occurs at index 0 in s, so we replace it with "eee".\n"ec" does not occur at index 2 in s, so we do nothing.\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 1000k == indices.length == sources.length == targets.length1 <= k <= 1000 <= indexes[i] < s.length1 <= sources[i].length, targets[i].length <= 50s consists of only lowercase English letters.sources[i] and targets[i] consist of only lowercase English letters.你会得到一个字符串 s (索引从 0 开始)，你必须对它执行 k 个替换操作。替换操作以三个长度均为 k 的并行数组给出：indices, sources, targets。
要完成第 i 个替换操作:
sources[i] 是否出现在 原字符串 s 的索引 indices[i] 处。targets[i] 替换 该子字符串。例如，如果 s = \"abcd\" ， indices[i] = 0 , sources[i] = \"ab\"， targets[i] = \"eee\" ，那么替换的结果将是 \"eeecd\" 。
所有替换操作必须 同时 发生，这意味着替换操作不应该影响彼此的索引。测试用例保证元素间不会重叠 。
\n\ns = \"abc\" ， indices = [0,1] ， sources = [\"ab\"，\"bc\"] 的测试用例将不会生成，因为 \"ab\" 和 \"bc\" 替换重叠。在对 s 执行所有替换操作后返回 结果字符串 。
子字符串 是字符串中连续的字符序列。
\n\n\n\n
示例 1：
\n\n
\n输入：s = \"abcd\", indices = [0,2], sources = [\"a\",\"cd\"], targets = [\"eee\",\"ffff\"]\n输出：\"eeebffff\"\n解释：\n\"a\" 从 s 中的索引 0 开始，所以它被替换为 \"eee\"。\n\"cd\" 从 s 中的索引 2 开始，所以它被替换为 \"ffff\"。\n\n\n
示例 2：
\n输入：s = \"abcd\", indices = [0,2], sources = [\"ab\",\"ec\"], targets = [\"eee\",\"ffff\"]\n输出：\"eeecd\"\n解释：\n\"ab\" 从 s 中的索引 0 开始，所以它被替换为 \"eee\"。\n\"ec\" 没有从原始的 S 中的索引 2 开始，所以它没有被替换。\n\n\n
\n\n
提示：
\n\n1 <= s.length <= 1000k == indices.length == sources.length == targets.length1 <= k <= 1000 <= indices[i] < s.length1 <= sources[i].length, targets[i].length <= 50s 仅由小写英文字母组成sources[i] 和 targets[i] 仅由小写英文字母组成\\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 \\u5c06\\u57282020\\u5e74\\u540e\\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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