diff --git a/src/main/kotlin/g0101_0200/s0107_binary_tree_level_order_traversal_ii/Solution.kt b/src/main/kotlin/g0101_0200/s0107_binary_tree_level_order_traversal_ii/Solution.kt
index 20f42b86f..240a1201b 100644
--- a/src/main/kotlin/g0101_0200/s0107_binary_tree_level_order_traversal_ii/Solution.kt
+++ b/src/main/kotlin/g0101_0200/s0107_binary_tree_level_order_traversal_ii/Solution.kt
@@ -5,7 +5,6 @@ package g0101_0200.s0107_binary_tree_level_order_traversal_ii
 
 import com_github_leetcode.TreeNode
 import java.util.Collections
-import kotlin.collections.ArrayList
 
 /*
  * Example:
diff --git a/src/main/kotlin/g0301_0400/s0373_find_k_pairs_with_smallest_sums/Solution.kt b/src/main/kotlin/g0301_0400/s0373_find_k_pairs_with_smallest_sums/Solution.kt
index 85bee3cf5..8f5257945 100644
--- a/src/main/kotlin/g0301_0400/s0373_find_k_pairs_with_smallest_sums/Solution.kt
+++ b/src/main/kotlin/g0301_0400/s0373_find_k_pairs_with_smallest_sums/Solution.kt
@@ -3,7 +3,6 @@ package g0301_0400.s0373_find_k_pairs_with_smallest_sums
 // #Medium #Array #Heap_Priority_Queue #2022_11_22_Time_1809_ms_(80.95%)_Space_119.1_MB_(66.67%)
 
 import java.util.PriorityQueue
-import kotlin.collections.ArrayList
 
 class Solution {
     private class Node(index: Int, num1: Int, num2: Int) {
diff --git a/src/main/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/Solution.kt b/src/main/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/Solution.kt
index f03ec90ba..c9add98ce 100644
--- a/src/main/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/Solution.kt
+++ b/src/main/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/Solution.kt
@@ -3,18 +3,12 @@ package g1701_1800.s1751_maximum_number_of_events_that_can_be_attended_ii
 // #Hard #Array #Dynamic_Programming #Binary_Search
 // #2023_06_18_Time_608_ms_(100.00%)_Space_104.6_MB_(100.00%)
 
-import java.util.Arrays
-
 @Suppress("NAME_SHADOWING")
 class Solution {
     fun maxValue(events: Array<IntArray>, k: Int): Int {
         if (k == 1) {
-            val value = Arrays.stream(events).max({ a: IntArray, b: IntArray -> a[2].compareTo(b[2]) })
-            return if (value.isPresent) {
-                value.get()[2]
-            } else {
-                throw NullPointerException()
-            }
+            val value = events.maxByOrNull { it[2] }
+            return value?.get(2) ?: throw NullPointerException()
         }
         val n = events.size
         events.sortWith { a: IntArray, b: IntArray -> a[0].compareTo(b[0]) }
diff --git a/src/main/kotlin/g2201_2300/s2286_booking_concert_tickets_in_groups/BookMyShow.kt b/src/main/kotlin/g2201_2300/s2286_booking_concert_tickets_in_groups/BookMyShow.kt
index 689e6a026..c9614f79f 100644
--- a/src/main/kotlin/g2201_2300/s2286_booking_concert_tickets_in_groups/BookMyShow.kt
+++ b/src/main/kotlin/g2201_2300/s2286_booking_concert_tickets_in_groups/BookMyShow.kt
@@ -4,7 +4,6 @@ package g2201_2300.s2286_booking_concert_tickets_in_groups
 // #2023_06_28_Time_1292_ms_(100.00%)_Space_98.3_MB_(100.00%)
 
 import java.util.ArrayDeque
-import java.util.Arrays
 import java.util.Deque
 
 @Suppress("NAME_SHADOWING")
@@ -35,8 +34,8 @@ class BookMyShow(n: Int, private val m: Int) {
         numZerosLeft = IntArray(this.n + 2)
         // initialize max and total, for max we firstly set values to m
         // segments of size 1 are placed starting from this.n - 1
-        Arrays.fill(max, this.n - 1, this.n + n - 1, m)
-        Arrays.fill(total, this.n - 1, this.n + n - 1, m.toLong())
+        max.fill(m, this.n - 1, this.n + n - 1)
+        total.fill(m.toLong(), this.n - 1, this.n + n - 1)
         // calculate values of max and total for segments based on values of their children
         var i = this.n - 2
         var i1 = i * 2 + 1
diff --git a/src/test/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/SolutionTest.kt b/src/test/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/SolutionTest.kt
index 669d13324..2f110501a 100644
--- a/src/test/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/SolutionTest.kt
+++ b/src/test/kotlin/g1701_1800/s1751_maximum_number_of_events_that_can_be_attended_ii/SolutionTest.kt
@@ -35,4 +35,12 @@ internal class SolutionTest {
             equalTo(9)
         )
     }
+
+    @Test
+    fun maxValue4() {
+        assertThat(
+            Solution().maxValue(arrayOf(intArrayOf(1, 2, 4), intArrayOf(3, 4, 3), intArrayOf(2, 3, 10)), 1),
+            equalTo(10)
+        )
+    }
 }