{ "data": { "question": { "questionId": "4126", "questionFrontendId": "3750", "categoryTitle": "Algorithms", "boundTopicId": 3838748, "title": "Minimum Number of Flips to Reverse Binary String", "titleSlug": "minimum-number-of-flips-to-reverse-binary-string", "content": "

You are given a positive integer n.

\n\n

Let s be the binary representation of n without leading zeros.

\n\n

The reverse of a binary string s is obtained by writing the characters of s in the opposite order.

\n\n

You may flip any bit in s (change 0 → 1 or 1 → 0). Each flip affects exactly one bit.

\n\n

Return the minimum number of flips required to make s equal to the reverse of its original form.

\n\n

 

\n

Example 1:

\n\n
\n

Input: n = 7

\n\n

Output: 0

\n\n

Explanation:

\n\n

The binary representation of 7 is "111". Its reverse is also "111", which is the same. Hence, no flips are needed.

\n
\n\n

Example 2:

\n\n
\n

Input: n = 10

\n\n

Output: 4

\n\n

Explanation:

\n\n

The binary representation of 10 is "1010". Its reverse is "0101". All four bits must be flipped to make them equal. Thus, the minimum number of flips required is 4.

\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "最少反转次数得到翻转二进制字符串", "translatedContent": "

给你一个 整数 n

\n\n

sn二进制表示(不含前导零)。

\n\n

二进制字符串 s反转 是指将 s 中的字符按相反顺序排列得到的字符串。

\n\n

你可以翻转 s 中的任意一位(将 0 → 11 → 0)。每次翻转 影响一位。

\n\n

请返回使 s 等于其原始形式的反转所需的 最少 翻转次数。

\n\n

 

\n\n

示例 1:

\n\n
\n

输入: n = 7

\n\n

输出: 0

\n\n

解释:

\n\n

7 的二进制表示为 \"111\"。其反转也是 \"111\",两者相同。因此,不需要翻转。

\n
\n\n

示例 2:

\n\n
\n

输入: n = 10

\n\n

输出: 4

\n\n

解释:

\n\n

10 的二进制表示为 \"1010\"。其反转为 \"0101\"。必须翻转所有四位才能使它们相等。因此,所需的最少翻转次数为 4。

\n
\n\n

 

\n\n

提示:

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