feat: 1207.独一无二的出现次数,新增rust解法

problems/1207.独一无二的出现次数.md

@@ -221,6 +221,28 @@ func uniqueOccurrences(arr []int) bool {
 }
 ```
 
+### Rust
+
+```rust
+use std::collections::{HashMap, HashSet};
+impl Solution {
+    pub fn unique_occurrences(arr: Vec<i32>) -> bool {
+        let mut hash = HashMap::<i32, i32>::new();
+        for x in arr {
+            *hash.entry(x).or_insert(0) += 1;
+        }
+        let mut set = HashSet::<i32>::new();
+        for (_k, v) in hash {
+            if set.contains(&v) {
+                return false
+            } else {
+                set.insert(v);
+            }
+        }
+        true
+    }
+}
+```