31 lines
970 B
Rust
31 lines
970 B
Rust
pub fn longest_common_prefix(mut strings: Vec<String>) -> String {
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// Sort the strings ascending by length.
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strings.sort_by_key(|a| a.len());
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// Then grab the shortest string.
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let shortest_string = match strings.first() {
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Some(string) => string,
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None => return String::new(),
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};
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// The shortest string must be the maximum possible prefix, so start with it.
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let mut prefix = shortest_string.clone();
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// Then loop over the shortest string's length and check if every string in
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// the list starts with the prefix, and if they don't, pop the last character
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// from the prefix.
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for _ in 0..shortest_string.len() {
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// If we find a prefix that all strings start with, we've found the longest
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// common one.
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if strings.iter().all(|string| string.starts_with(&prefix)) {
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break;
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} else {
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prefix.pop();
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}
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}
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// If by the end there is no longest common prefix, the prefix will be an
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// empty string.
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prefix
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}
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