You are given a deck of cards represented by a string array cards, and each card displays two lowercase letters.
You are also given a letter x. You play a game with the following rules:
x in any position.Return the maximum number of points you can gain with optimal play.
\n\nTwo cards are compatible if the strings differ in exactly 1 position.
\n\n\n
Example 1:
\n\nInput: cards = ["aa","ab","ba","ac"], x = "a"
\n\nOutput: 2
\n\nExplanation:
\n\n"ab" and "ac", which are compatible because they differ at only index 1."aa" and "ba", which are compatible because they differ at only index 0.Because there are no more compatible pairs, the total score is 2.
\nExample 2:
\n\nInput: cards = ["aa","ab","ba"], x = "a"
\n\nOutput: 1
\n\nExplanation:
\n\n"aa" and "ba".Because there are no more compatible pairs, the total score is 1.
\nExample 3:
\n\nInput: cards = ["aa","ab","ba","ac"], x = "b"
\n\nOutput: 0
\n\nExplanation:
\n\nThe only cards that contain the character 'b' are "ab" and "ba". However, they differ in both indices, so they are not compatible. Thus, the output is 0.
\n
Constraints:
\n\n2 <= cards.length <= 105cards[i].length == 2cards[i] is composed of only lowercase English letters between 'a' and 'j'.x is a lowercase English letter between 'a' and 'j'.给你一副由字符串数组 cards 表示的牌，每张牌上都显示两个小写字母。
同时给你一个字母 x。你按照以下规则进行游戏：
x。返回在最优策略下你能获得的 最大 分数。
\n\n如果两张牌的字符串在 恰好 1 个位置上不同，则它们是兼容的。
\n\n\n\n
示例 1:
\n\n输入： cards = [\"aa\",\"ab\",\"ba\",\"ac\"], x = \"a\"
\n\n输出： 2
\n\n解释：
\n\n\"ab\" 和 \"ac\"，它们是兼容的，因为仅在下标 1 处不同。\"aa\" 和 \"ba\"，它们是兼容的，因为仅在下标 0 处不同。因为没有更多兼容的牌对，总分为 2。
\n示例 2:
\n\n输入： cards = [\"aa\",\"ab\",\"ba\"], x = \"a\"
\n\n输出： 1
\n\n解释：
\n\n\"aa\" 和 \"ba\"。因为没有更多兼容的牌对，总分为 1。
\n示例 3:
\n\n输入： cards = [\"aa\",\"ab\",\"ba\",\"ac\"], x = \"b\"
\n\n输出： 0
\n\n解释：
\n\n唯一包含字符 'b' 的牌是 \"ab\" 和 \"ba\"。然而，它们在两个下标上都不同，所以它们不兼容。因此，输出为 0。
\n\n
提示:
\n\n2 <= cards.length <= 105cards[i].length == 2cards[i] 仅由 'a' 到 'j' 之间的小写英文字母组成。x 是一个 'a' 到 'j' 之间的小写英文字母。both, cnt1[c], cnt2[c] as the counts of cards with x in both positions, only the first position (other letter c), and only the second position.",
"Let solve(cnt, have) be the maximum pairs you can form from one‐sided counts cnt plus have two‐sided cards by sorting cnt, computing the total, and applying the same logic as in the solution.",
"Return the maximum over i = 0..both of solve(cnt1, i) + solve(cnt2, both - i)."
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