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<head><title>counting bits</title>
<link rel="stylesheet" href="/style.css">
</head>
<body>
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<script src="/third-party/highlight/highlight.js"></script>
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<h2>Yanzhan's solution for "counting bits"</h2>
<ul>
<li>Hi, I'm Yanzhan. For more algothmic problems, visit my Youtube Channel <a href="https://www.youtube.com/channel/UCDkz-__gl3frqLexukpG0DA?view_as=subscriber" target=_blank>[Yanzhan Yang's Youtube Channel]</a> or my Twitter Account <a href="https://twitter.com/YangYanzhan" target=_blank>[Yanzhan Yang's Twitter]</a> or my GitHub HomePage <a href="https://github.com/yangyanzhan/code-camp" target=_blank>[Yanzhan Yang's GitHub Project]</a> .</li>
<li>It's fascinating to solve algothmic problems, follow Yanzhan to learn more!</li>
</ul>
<div>
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<div>
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<div>
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<h3>
solution:
</h3>
<pre class="yanzhan-hidden"><code class="c++">class Solution {
int bits(int num) {
int num_to_bits[16] = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};
int res = 0;
while (num > 0) {
int nibble = num % 16;
res += num_to_bits[nibble];
num /= 16;
}
return res;
}
public:
vector<int> countBits(int num) {
vector<int> res;
for (int i = 0; i <= num; i++) {
res.push_back(bits(i));
}
return res;
}
};
</code></pre>
<ul class="yanzhan-hidden">
<li><a href="/index.html" target=_blank>[Go Back To HomePage]</a></li>
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