Write a function that takes the binary representation of an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight).
\n\nNote:
\n\n-3.\n
Example 1:
\n\n\nInput: n = 00000000000000000000000000001011\nOutput: 3\nExplanation: The input binary string 00000000000000000000000000001011 has a total of three '1' bits.\n\n\n
Example 2:
\n\n\nInput: n = 00000000000000000000000010000000\nOutput: 1\nExplanation: The input binary string 00000000000000000000000010000000 has a total of one '1' bit.\n\n\n
Example 3:
\n\n\nInput: n = 11111111111111111111111111111101\nOutput: 31\nExplanation: The input binary string 11111111111111111111111111111101 has a total of thirty one '1' bits.\n\n\n
\n
Constraints:
\n\n32.\nFollow up: If this function is called many times, how would you optimize it?", "translatedTitle": "位1的个数", "translatedContent": "
编写一个函数，输入是一个无符号整数（以二进制串的形式），返回其二进制表达式中数字位数为 '1' 的个数（也被称为汉明重量）。
\n\n\n\n
提示：
\n\n-3。\n\n
示例 1：
\n\n\n输入：n = 00000000000000000000000000001011\n输出：3\n解释：输入的二进制串 00000000000000000000000000001011 中，共有三位为 '1'。\n\n\n示例 2：
\n\n\n输入：n = 00000000000000000000000010000000\n输出：1\n解释：输入的二进制串 00000000000000000000000010000000 中，共有一位为 '1'。\n\n\n
示例 3：
\n\n\n输入：n = 11111111111111111111111111111101\n输出：31\n解释：输入的二进制串 11111111111111111111111111111101 中，共有 31 位为 '1'。\n\n
\n\n
提示：
\n\n32 的 二进制串 。\n\n
进阶：
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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "00000000000000000000000000001011\n00000000000000000000000010000000\n11111111111111111111111111111101",
"__typename": "QuestionNode"
}
}
}clang 11<\\/code> \\u91c7\\u7528\\u6700\\u65b0C++ 20\\u6807\\u51c6\\u3002<\\/p>\\r\\n\\r\\n-O2<\\/code>\\u7ea7\\u4f18\\u5316\\u3002AddressSanitizer<\\/a> \\u4e5f\\u88ab\\u5f00\\u542f\\u6765\\u68c0\\u6d4bout-of-bounds<\\/code>\\u548cuse-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\nOpenJDK 17<\\/code>\\u3002\\u53ef\\u4ee5\\u4f7f\\u7528Java 8\\u7684\\u7279\\u6027\\u4f8b\\u5982\\uff0clambda expressions \\u548c stream API\\u3002<\\/p>\\r\\n\\r\\nPython 2.7.12<\\/code><\\/p>\\r\\n\\r\\nGCC 8.2<\\/code>\\uff0c\\u91c7\\u7528GNU11\\u6807\\u51c6\\u3002<\\/p>\\r\\n\\r\\n-O1<\\/code>\\u7ea7\\u4f18\\u5316\\u3002 AddressSanitizer<\\/a>\\u4e5f\\u88ab\\u5f00\\u542f\\u6765\\u68c0\\u6d4bout-of-bounds<\\/code>\\u548cuse-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n\\r\\nstruct hash_entry {\\r\\n int id; \\/* we'll use this field as the key *\\/\\r\\n char name[10];\\r\\n UT_hash_handle hh; \\/* makes this structure hashable *\\/\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\\r\\n\\r\\n\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\\r\\n\\r\\n\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\"],\"csharp\":[\"C#\",\"Node.js 16.13.2<\\/code><\\/p>\\r\\n\\r\\n--harmony<\\/code> \\u6807\\u8bb0\\u6765\\u5f00\\u542f \\u65b0\\u7248ES6\\u7279\\u6027<\\/a>\\u3002<\\/p>\\r\\n\\r\\nRuby 3.1<\\/code>\\u6267\\u884c<\\/p>\\r\\n\\r\\nSwift 5.5.2<\\/code><\\/p>\\r\\n\\r\\nGo 1.21<\\/code><\\/p>\\r\\n\\r\\nPython 3.10<\\/code><\\/p>\\r\\n\\r\\nScala 2.13<\\/code><\\/p>\"],\"kotlin\":[\"Kotlin\",\"Kotlin 1.9.0<\\/code><\\/p>\\r\\n\\r\\nrust 1.58.1<\\/code><\\/p>\\r\\n\\r\\nPHP 8.1<\\/code>.<\\/p>\\r\\n\\r\\n