You are given a string source of size n, a string pattern that is a subsequence of source, and a sorted integer array targetIndices that contains distinct numbers in the range [0, n - 1].
We define an operation as removing a character at an index idx from source such that:
idx is an element of targetIndices.pattern remains a subsequence of source after removing the character.Performing an operation does not change the indices of the other characters in source. For example, if you remove 'c' from "acb", the character at index 2 would still be 'b'.
Return the maximum number of operations that can be performed.
\n\n\n
Example 1:
\n\nInput: source = "abbaa", pattern = "aba", targetIndices = [0,1,2]
\n\nOutput: 1
\n\nExplanation:
\n\nWe can't remove source[0] but we can do either of these two operations:
source[1], so that source becomes "a_baa".source[2], so that source becomes "ab_aa".Example 2:
\n\nInput: source = "bcda", pattern = "d", targetIndices = [0,3]
\n\nOutput: 2
\n\nExplanation:
\n\nWe can remove source[0] and source[3] in two operations.
Example 3:
\n\nInput: source = "dda", pattern = "dda", targetIndices = [0,1,2]
\n\nOutput: 0
\n\nExplanation:
\n\nWe can't remove any character from source.
Example 4:
\n\nInput: source = "yeyeykyded", pattern = "yeyyd", targetIndices = [0,2,3,4]
\n\nOutput: 2
\n\nExplanation:
\n\nWe can remove source[2] and source[3] in two operations.
\n
Constraints:
\n\n1 <= n == source.length <= 3 * 1031 <= pattern.length <= n1 <= targetIndices.length <= ntargetIndices is sorted in ascending order.targetIndices contains distinct elements in the range [0, n - 1].source and pattern consist only of lowercase English letters.pattern appears as a subsequence in source.给你一个长度为 n 的字符串 source ，一个字符串 pattern 且它是 source 的 子序列 ，和一个 有序 整数数组 targetIndices ，整数数组中的元素是 [0, n - 1] 中 互不相同 的数字。
定义一次 操作 为删除 source 中下标在 idx 的一个字符，且需要满足：
idx 是 targetIndices 中的一个元素。pattern 仍然是 source 的一个 子序列 。执行操作后 不会 改变字符在 source 中的下标位置。比方说，如果从 \"acb\" 中删除 'c' ，下标为 2 的字符仍然是 'b' 。
请你返回 最多 可以进行多少次删除操作。
\n\n子序列指的是在原字符串里删除若干个（也可以不删除）字符后，不改变顺序地连接剩余字符得到的字符串。
\n\n\n\n
示例 1：
\n\n输入：source = \"abbaa\", pattern = \"aba\", targetIndices = [0,1,2]
\n\n输出：1
\n\n解释：
\n\n不能删除 source[0] ，但我们可以执行以下两个操作之一：
source[1] ，source 变为 \"a_baa\" 。source[2] ，source 变为 \"ab_aa\" 。示例 2：
\n\n输入：source = \"bcda\", pattern = \"d\", targetIndices = [0,3]
\n\n输出：2
\n\n解释：
\n\n进行两次操作，删除 source[0] 和 source[3] 。
示例 3：
\n\n输入：source = \"dda\", pattern = \"dda\", targetIndices = [0,1,2]
\n\n输出：0
\n\n解释：
\n\n不能在 source 中删除任何字符。
示例 4：
\n\n输入：source = \"yeyeykyded\", pattern = \"yeyyd\", targetIndices = [0,2,3,4]
\n\n输出：2
\n\n解释：
\n\n进行两次操作，删除 source[2] 和 source[3] 。
\n\n
提示：
\n\n1 <= n == source.length <= 3 * 1031 <= pattern.length <= n1 <= targetIndices.length <= ntargetIndices 是一个升序数组。targetIndices 包含的元素在 [0, n - 1] 中且互不相同。source 和 pattern 只包含小写英文字母。pattern 是 source 的一个子序列。targetIndices, make the choice to remove or not remove the character."
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