Merge pull request Rohit0301#66 from sarthakw7/sarth

Longest consecutive sequence que. solved

Leetcode/Longest_Consecutive_Sequence/longest_consecutive_sequence.java

@@ -0,0 +1,20 @@
+
+class Solution {
+    public int longestConsecutive(int[] nums) {
+        if(nums == null || nums.length == 0) return 0;
+
+        Set<Integer> set = new HashSet<>();
+        for(int n: nums) set.add(n);
+        int result = 0;
+        for(int i=0; i<nums.length; i++) {
+            int res = 1;
+            if(!set.contains(nums[i] - 1)) {
+                while(set.contains(++nums[i])) {
+                    res++;
+                }
+            }
+            result = Math.max(res, result);
+        }
+        return result;
+    }
+}