Create: 0535-encode-and-decode-tinyURL.rs

AkifhanIlgaz · AkifhanIlgaz · commit 99b6928d2459 · 2023-01-13T00:37:56.000+03:00
diff --git a/rust/0535-encode-and-decode-tinyURL.rs b/rust/0535-encode-and-decode-tinyURL.rs
@@ -0,0 +1,37 @@
+use std::collections::HashMap;
+
+const BASE: &str = "http://tinyurl.com";
+
+struct Codec {
+    url_map: HashMap<String, String>,
+}
+
+impl Codec {
+    fn new() -> Self {
+        Self {
+            url_map: HashMap::new(),
+        }
+    }
+
+    // Encodes a URL to a shortened URL.
+    fn encode(&mut self, longURL: String) -> String {
+        let short_url = format!("{}{}", BASE, Self::generate_hash(&longURL));
+        self.url_map.insert(short_url.clone(), longURL.clone());
+        short_url
+    }
+
+    // Decodes a shortened URL to its original URL.
+    fn decode(&self, shortURL: String) -> String {
+        self.url_map.get(&shortURL).unwrap().clone()
+    }
+
+    fn generate_hash(url: &String) -> i32 {
+        let mut hash = 5831;
+
+        for ch in url.chars() {
+            hash = ((hash << 5) + hash) + (ch as i32);
+        }
+
+        hash
+    }
+}
