feat: longest consecutive sequence

Author: minji-go

longest-consecutive-sequence/minji-go.java

@@ -0,0 +1,22 @@
+class Solution {
+    public int longestConsecutive(int[] nums) {
+        Set<Integer> set = new HashSet<>();
+        for(int num: nums) {
+            set.add(num);
+        }
+
+        int answer = 0;
+        for(int num: nums){
+            if(set.contains(num-1)){
+                continue;
+            }
+            int length = 1;
+            while (set.contains(num+length)){
+                length++;
+            }
+            answer = Math.max(answer, length);
+        }
+
+        return answer;
+    }
+}