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</pre></div><pre class="rust"><code><span class="kw">use </span>std::cmp::max;
<span class="kw">fn </span>lcs_collected(a: <span class="kw-2">&</span>str, b: <span class="kw-2">&</span>str, n: usize, m: usize, dp: <span class="kw-2">&mut </span>Vec<Vec<i32>>) -> Vec<char> {
<span class="kw">let </span><span class="kw-2">mut </span>i = n;
<span class="kw">let </span><span class="kw-2">mut </span>j = m;
<span class="kw">let </span><span class="kw-2">mut </span>result = Vec::new();
<span class="kw">while </span>i > <span class="number">0 </span>&& j > <span class="number">0 </span>{
<span class="kw">if </span>a.chars().nth(i - <span class="number">1</span>).unwrap() == b.chars().nth(j - <span class="number">1</span>).unwrap() {
result.push(a.chars().nth(i - <span class="number">1</span>).unwrap());
i -= <span class="number">1</span>;
j -= <span class="number">1</span>;
} <span class="kw">else if </span>dp[i - <span class="number">1</span>][j] > dp[i][j - <span class="number">1</span>] {
i -= <span class="number">1</span>;
} <span class="kw">else </span>{
j -= <span class="number">1</span>;
}
}
result.reverse();
result
}
<span class="kw">fn </span>create_dp(a: <span class="kw-2">&</span>str, b: <span class="kw-2">&</span>str) -> Vec<Vec<i32>> {
<span class="kw">let </span>n = a.len();
<span class="kw">let </span>m = b.len();
<span class="kw">let </span><span class="kw-2">mut </span>dp = <span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="number">0</span>; m + <span class="number">1</span>]; n + <span class="number">1</span>];
<span class="kw">for </span>i <span class="kw">in </span><span class="number">1</span>..=n {
<span class="kw">for </span>j <span class="kw">in </span><span class="number">1</span>..=m {
<span class="kw">if </span>a.chars().nth(i - <span class="number">1</span>).unwrap() == b.chars().nth(j - <span class="number">1</span>).unwrap() {
dp[i][j] = dp[i - <span class="number">1</span>][j - <span class="number">1</span>] + <span class="number">1</span>;
} <span class="kw">else </span>{
dp[i][j] = max(dp[i - <span class="number">1</span>][j], dp[i][j - <span class="number">1</span>]);
}
}
}
dp
}
<span class="kw">fn </span>normalized_len_compare(subject: <span class="kw-2">&</span>str, sequence: <span class="kw-2">&</span>str) -> f64 {
<span class="kw">let </span>min_window = sequence.len();
<span class="kw">let </span><span class="kw-2">mut </span>window = min_window;
<span class="kw">if </span>min_window > subject.len() || min_window == <span class="number">0</span>{
<span class="kw">return </span><span class="number">0.0</span>;
}
<span class="kw">while </span>window <= subject.len() {
<span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
<span class="kw">while </span>i + window <= subject.len() {
<span class="kw">let </span>sub = <span class="kw-2">&</span>subject[i..i + window];
<span class="kw">let </span>n = sub.len();
<span class="kw">let </span>m = sequence.len();
<span class="kw">let </span><span class="kw-2">mut </span>dp = create_dp(sub, sequence);
<span class="kw">let </span>lcs = lcs_collected(sub, sequence, n, m, <span class="kw-2">&mut </span>dp);
<span class="kw">if </span>lcs.len() == sequence.len() {
<span class="kw">return </span>min_window <span class="kw">as </span>f64 / window <span class="kw">as </span>f64;
}
i += <span class="number">1</span>;
}
window += <span class="number">1</span>;
}
<span class="kw">return </span><span class="number">0.0</span>;
}
<span class="doccomment">/// Compares two strings and returns a score based on the longest common subsequence (LCS) and normalized length comparison.
///
/// # Arguments
///
/// * `str1` - A reference to the first string.
/// * `q` - A reference to the query string.
///
/// # Returns
///
/// * A floating-point score representing the similarity between `str1` and `q`.
///
/// # Examples
///
/// ```
/// let score = compare("AGGTAB", "AGGTAB");
/// assert_eq!(score, 6.0);
/// ```
</span><span class="kw">pub fn </span>compare(str1: <span class="kw-2">&</span>str, q: <span class="kw-2">&</span>str) -> f64 {
<span class="kw">let </span>len1 = str1.len();
<span class="kw">let </span>len2 = q.len();
<span class="kw">if </span>len1 == <span class="number">0 </span>|| len2 == <span class="number">0 </span>{
<span class="kw">return </span><span class="number">0.0</span>;
}
<span class="kw">let </span><span class="kw-2">mut </span>dp = create_dp(str1, q);
<span class="kw">let </span>lcs = lcs_collected(str1, q, len1, len2, <span class="kw-2">&mut </span>dp).
iter().collect::<String>();
<span class="kw">if </span>lcs.len() <= <span class="number">1 </span>{
<span class="kw">return </span><span class="number">0.0</span>;
}
lcs.len() <span class="kw">as </span>f64 * (normalized_len_compare(str1, <span class="kw-2">&</span>lcs))
}
<span class="doccomment">/// Ranks a list of strings based on their similarity to a query string using the `compare` function.
///
/// # Arguments
///
/// * `query` - A reference to the query string.
/// * `subjects` - A vector of references to the subject strings to be ranked.
///
/// # Returns
///
/// * A vector of tuples containing the similarity score and the corresponding subject string, sorted by score in descending order.
///
/// # Examples
///
/// ```
/// let query = "Ad";
/// let subjects = vec!["Ad_Fields", "Users", "Aged_groups"];
/// let result = rank(query, subjects);
/// assert_eq!(result, vec![(2.0, "Ad_Fields"), (1.0, "Aged_groups"), (0.0, "Users")]);
/// ```
</span><span class="kw">pub fn </span>rank<<span class="lifetime">'a</span>>(query: <span class="kw-2">&</span>str, subjects: Vec<<span class="kw-2">&</span><span class="lifetime">'a </span>str>) -> Vec<(f64, <span class="kw-2">&</span><span class="lifetime">'a </span>str)> {
<span class="kw">let </span><span class="kw-2">mut </span>result = subjects
.iter()
.map(|<span class="kw-2">&</span>subject| (compare(subject, query), subject))
.collect::<Vec<(f64, <span class="kw-2">&</span>str)>>();
result.sort_by(|a, b| b.<span class="number">0</span>.partial_cmp(<span class="kw-2">&</span>a.<span class="number">0</span>).unwrap());
result
}
<span class="doccomment">/// Ranks a list of structured objects based on their similarity to a query string using a custom accessor function.
///
/// # Arguments
///
/// * `query` - A reference to the query string.
/// * `subjects` - A vector of structured objects to be ranked.
/// * `accessor` - A function that takes a reference to a structured object and returns a string for comparison.
///
/// # Returns
///
/// * A vector of tuples containing the similarity score and the corresponding structured object, sorted by score in descending order.
///
/// # Examples
///
/// ```
/// struct Person {
/// name: String,
/// }
///
/// let query = "Ad";
/// let subjects = vec![
/// Person { name: "Ad_Fields".to_string() },
/// Person { name: "Users".to_string() },
/// Person { name: "Aged_groups".to_string() },
/// ];
/// let result = struct_rank(query, subjects, |p| p.name.clone());
/// assert_eq!(result[0].0, 2.0);
/// assert_eq!(result[0].1.name, "Ad_Fields");
/// ```
</span><span class="kw">pub fn </span>struct_rank<<span class="lifetime">'a</span>, T: Clone>(
query: <span class="kw-2">&</span>str,
subjects: Vec<T>,
accessor: <span class="kw">fn</span>(<span class="kw-2">&</span>T) -> String,
) -> Vec<(f64, T)> {
<span class="kw">let </span><span class="kw-2">mut </span>result = subjects
.iter()
.map(|subject| (compare(<span class="kw-2">&</span>accessor(subject), query), subject.clone()))
.collect::<Vec<(f64, T)>>();
result.sort_by(|a, b| b.<span class="number">0</span>.partial_cmp(<span class="kw-2">&</span>a.<span class="number">0</span>).unwrap());
result
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attr">#[test]
</span><span class="kw">fn </span>test_lcs_collected() {
<span class="kw">let </span>a = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>b = <span class="string">"GXTXAYB"</span>;
<span class="kw">let </span>n = a.len();
<span class="kw">let </span>m = b.len();
<span class="kw">let </span><span class="kw-2">mut </span>dp = create_dp(a, b);
<span class="kw">let </span>result = lcs_collected(a, b, n, m, <span class="kw-2">&mut </span>dp);
<span class="macro">assert_eq!</span>(result, <span class="macro">vec!</span>[<span class="string">'G'</span>, <span class="string">'T'</span>, <span class="string">'A'</span>, <span class="string">'B'</span>]);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_lcs_collected_with_no_match() {
<span class="kw">let </span>a = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>b = <span class="string">"XYZ"</span>;
<span class="kw">let </span>n = a.len();
<span class="kw">let </span>m = b.len();
<span class="kw">let </span><span class="kw-2">mut </span>dp = create_dp(a, b);
<span class="kw">let </span>result = lcs_collected(a, b, n, m, <span class="kw-2">&mut </span>dp);
<span class="macro">assert_eq!</span>(result, Vec::new());
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_create_dp() {
<span class="kw">let </span>a = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>b = <span class="string">"GXTXAYB"</span>;
<span class="kw">let </span>dp = create_dp(a, b);
<span class="macro">assert_eq!</span>(dp[<span class="number">6</span>][<span class="number">7</span>], <span class="number">4</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_normalized_len_compare_with_perfect_match() {
<span class="kw">let </span>subject = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>sequence = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>result = normalized_len_compare(subject, sequence);
<span class="macro">assert_eq!</span>(result, <span class="number">1.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_normalized_len_compare_with_no_match() {
<span class="kw">let </span>subject = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>sequence = <span class="string">"GXT"</span>;
<span class="kw">let </span>result = normalized_len_compare(subject, sequence);
<span class="macro">assert_eq!</span>(result, <span class="number">0.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_normalized_len_compare_with_partial_match() {
<span class="kw">let </span>subject = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>sequence = <span class="string">"GT"</span>;
<span class="kw">let </span>result = normalized_len_compare(subject, sequence);
<span class="macro">assert_eq!</span>(result, <span class="number">1.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_normalized_len_compare_with_spread_out_match() {
<span class="kw">let </span>subject = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>sequence = <span class="string">"GA"</span>;
<span class="kw">let </span>result = normalized_len_compare(subject, sequence);
<span class="macro">assert_eq!</span>(result, (<span class="number">2.0 </span>/ <span class="number">3.0</span>));
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_compare_with_a_perfect_match() {
<span class="kw">let </span>str1 = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>q = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>result = compare(str1, q);
<span class="macro">assert_eq!</span>(result, <span class="number">6.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_compare_with_partial_match() {
<span class="kw">let </span>str1 = <span class="string">"Ad_Fields"</span>;
<span class="kw">let </span>q = <span class="string">"Ad"</span>;
<span class="kw">let </span>result = compare(str1, q);
<span class="macro">assert_eq!</span>(result, <span class="number">2.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_compare_with_no_match() {
<span class="kw">let </span>str1 = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>q = <span class="string">"XYZ"</span>;
<span class="kw">let </span>result = compare(str1, q);
<span class="macro">assert_eq!</span>(result, <span class="number">0.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_compare_with_spread_out_match() {
<span class="kw">let </span>str1 = <span class="string">"AGGTAB"</span>;
<span class="kw">let </span>q = <span class="string">"GA"</span>;
<span class="kw">let </span>result = compare(str1, q);
<span class="macro">assert_eq!</span>(result, <span class="number">2.0 </span>/ <span class="number">3.0 </span>* <span class="number">2.0</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_rank() {
<span class="kw">let </span>query = <span class="string">"Ad"</span>;
<span class="kw">let </span>subjects = <span class="macro">vec!</span>[<span class="string">"Ad_Fields"</span>, <span class="string">"Users"</span>, <span class="string">"Aged_groups"</span>];
<span class="kw">let </span>result = rank(query, subjects);
<span class="macro">assert_eq!</span>(
result,
<span class="macro">vec!</span>[(<span class="number">2.0</span>, <span class="string">"Ad_Fields"</span>), (<span class="number">1.0</span>, <span class="string">"Aged_groups"</span>), (<span class="number">0.0</span>, <span class="string">"Users"</span>),]
);
}
}
</code></pre></div></section></main></body></html>