diff --git a/src/main/kotlin/g3701_3800/s3729_count_distinct_subarrays_divisible_by_k_in_sorted_array/Solution.kt b/src/main/kotlin/g3701_3800/s3729_count_distinct_subarrays_divisible_by_k_in_sorted_array/Solution.kt
index 68884c1d..39dd6beb 100644
--- a/src/main/kotlin/g3701_3800/s3729_count_distinct_subarrays_divisible_by_k_in_sorted_array/Solution.kt
+++ b/src/main/kotlin/g3701_3800/s3729_count_distinct_subarrays_divisible_by_k_in_sorted_array/Solution.kt
@@ -15,7 +15,7 @@ class Solution {
             if (i > 0 && x != nums[i - 1]) {
                 var s = sum
                 for (t in i - lastStart downTo 1) {
-                    cnt.merge((s % k).toInt(), 1) { a: Int?, b: Int? -> Integer.sum(a!!, b!!) }
+                    cnt.merge((s % k).toInt(), 1) { a: Int, b: Int -> Integer.sum(a, b) }
                     s -= nums[i - 1].toLong()
                 }
                 lastStart = i