{ "data": { "question": { "questionId": "1994", "questionFrontendId": "1864", "categoryTitle": "Algorithms", "boundTopicId": 772195, "title": "Minimum Number of Swaps to Make the Binary String Alternating", "titleSlug": "minimum-number-of-swaps-to-make-the-binary-string-alternating", "content": "

Given a binary string s, return the minimum number of character swaps to make it alternating, or -1 if it is impossible.

\n\n

The string is called alternating if no two adjacent characters are equal. For example, the strings "010" and "1010" are alternating, while the string "0100" is not.

\n\n

Any two characters may be swapped, even if they are not adjacent.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "111000"\nOutput: 1\nExplanation: Swap positions 1 and 4: "111000" -> "101010"\nThe string is now alternating.\n
\n\n

Example 2:

\n\n
\nInput: s = "010"\nOutput: 0\nExplanation: The string is already alternating, no swaps are needed.\n
\n\n

Example 3:

\n\n
\nInput: s = "1110"\nOutput: -1\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "构成交替字符串需要的最小交换次数", "translatedContent": "

给你一个二进制字符串 s ，现需要将其转化为一个 交替字符串 。请你计算并返回转化所需的 最小 字符交换次数，如果无法完成转化，返回 -1 。

\n\n

交替字符串 是指：相邻字符之间不存在相等情况的字符串。例如，字符串 \"010\" 和 \"1010\" 属于交替字符串，但 \"0100\" 不是。

\n\n

任意两个字符都可以进行交换，不必相邻 。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：s = \"111000\"\n输出：1\n解释：交换位置 1 和 4：\"111000\" -> \"101010\" ，字符串变为交替字符串。\n
\n\n

示例 2：

\n\n
\n输入：s = \"010\"\n输出：0\n解释：字符串已经是交替字符串了，不需要交换。\n
\n\n

示例 3：

\n\n
\n输入：s = \"1110\"\n输出：-1\n
\n\n

 

\n\n

提示：

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