20240511 Finished

src/problem/mod.rs

@@ -127,4 +127,5 @@ mod p290_word_pattern;
 mod p205_isomorphic_strings;
 mod p242_valid_anagram;
 mod p49_group_anagrams;
-mod p202_happy_number;
+mod p202_happy_number;
+mod p219_contains_duplicate_ii;

src/problem/p219_contains_duplicate_ii.rs

@@ -0,0 +1,45 @@
+/**
+ * [219] Contains Duplicate II
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+use std::collections::HashMap;
+
+impl Solution {
+    pub fn contains_nearby_duplicate(nums: Vec<i32>, k: i32) -> bool {
+        let mut map = HashMap::new();
+
+        for (i, v) in nums.iter().enumerate() {
+            if let Some(last_pos) = map.get_mut(v) {
+                let distance:i32 = (*last_pos - i as i32);
+                let distance = distance.abs();
+
+                if distance > 0 && distance <= k {
+                    return true;
+                } else {
+                    *last_pos = i as i32;
+                }
+
+            } else {
+                map.insert(*v, i as i32); 
+            }
+        }
+
+        false
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_219() {
+        assert!(Solution::contains_nearby_duplicate(vec![1,2,3,1], 3));
+        assert!(!Solution::contains_nearby_duplicate(vec![1,2,3,1,2,3], 2));
+    }
+}