diff --git a/solved/LeetCode/Challenges/2020/January/25.kt b/solved/LeetCode/Challenges/2020/January/25.kt
new file mode 100644
index 00000000..5e14749d
--- /dev/null
+++ b/solved/LeetCode/Challenges/2020/January/25.kt
@@ -0,0 +1,16 @@
+class Solution {
+  fun kLengthApart(nums: IntArray, k: Int): Boolean {
+    var posOnes = mutableListOf<Int>()
+    for ((i, v) in nums.withIndex()) {
+      if (v == 1) {
+        posOnes.add(i)
+      }
+    }
+    for (i in 1 until posOnes.size) {
+      if (posOnes[i] - posOnes[i - 1] <= k) {
+        return false
+      }
+    }
+    return true
+  }
+}