diff --git a/longest-consecutive-sequence/sol.go b/longest-consecutive-sequence/sol.go
index be2f735..17cee2f 100644
--- a/longest-consecutive-sequence/sol.go
+++ b/longest-consecutive-sequence/sol.go
@@ -5,21 +5,20 @@ func longestConsecutive(nums []int) (max int) {
 	for _, n := range nums {
 		exists[n] = true
 	}
-	done := make(map[int]bool, len(nums))
 	for _, n := range nums {
-		if _, ok := done[n]; !ok {
-			done[n] = true
+		if _, ok := exists[n]; ok {
+			exists[n] = false
 			l := 1
 			for exists[n+1] {
 				l++
 				n++
-				done[n] = true
+				exists[n] = false
 			}
 			n -= l - 1
 			for exists[n-1] {
 				l++
 				n--
-				done[n] = true
+				exists[n] = false
 			}
 			if l > max {
 				max = l