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src/main/kotlin/p31xx/Problem3159.kt

@@ -0,0 +1,19 @@
+package p31xx
+
+import util.expect
+
+fun main() {
+    class Solution {
+        fun occurrencesOfElement(nums: IntArray, queries: IntArray, x: Int): IntArray {
+            return nums.indices.filter { nums[it] == x }.let { indices ->
+                queries.map { indices.getOrNull(it - 1) ?: -1 }
+            }.toIntArray()
+        }
+    }
+
+    expect {
+        Solution().occurrencesOfElement(
+            intArrayOf(), intArrayOf(), 1
+        )
+    }
+}