diff --git a/.travis.yml b/.travis.yml
index 2a28131..1a5fc88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,9 @@ language: crystal
 before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -y ruby default-jdk haskell-platform python3
+  - curl -s "https://get.sdkman.io" | bash
+  - source "$HOME/.sdkman/bin/sdkman-init.sh"
+  - sdk install kotlin
 
 install: make clean build
 
diff --git a/Makefile b/Makefile
index 0ba9231..06852f4 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ build:
 	g++ -O2 main.cpp -o $(BIN_DIR)/cpp
 	javac -d $(BIN_DIR) Main.java
 	ghc -O2 main.hs -outputdir=$(BUILD_DIR) -o $(BIN_DIR)/haskell
+	kotlinc main.kt -include-runtime -d $(BIN_DIR)/kotlin.jar
 
 test:
 	mkdir $(TMP_DIR)
@@ -32,4 +33,6 @@ test:
 	@cmp $(TMP_DIR)/crystal.out $(TMP_DIR)/haskell.out || (echo "Failed: Haskell" && exit 1)
 	python3 main.py < $(TMP_DIR)/test_data.in > $(TMP_DIR)/python3.out
 	@cmp $(TMP_DIR)/crystal.out $(TMP_DIR)/python3.out || (echo "Failed: Python3" && exit 1)
+	java -jar $(BIN_DIR)/kotlin.jar < $(TMP_DIR)/test_data.in > $(TMP_DIR)/kotlin.out
+	@cmp $(TMP_DIR)/crystal.out $(TMP_DIR)/kotlin.out || (echo "Failed: Kotlin" && exit 1)
 	@echo "Passed"
diff --git a/README.md b/README.md
index 6d2d23f..b0f17ec 100644
--- a/README.md
+++ b/README.md
@@ -80,3 +80,4 @@ Your output should consist of a single line for each test case containing n numb
 - [scps940707](https://github.com/scps940707) YyWang - Java
 - [sifmelcara](https://github.com/sifmelcara) mingchuan - Haskell
 - [chuanchan1116](https://github.com/chuanchan1116) William Tsai - Python 3
+- [david50407](https://github.com/david50407) David Kuo - Kotlin
diff --git a/main.kt b/main.kt
new file mode 100644
index 0000000..1b1c38e
--- /dev/null
+++ b/main.kt
@@ -0,0 +1,89 @@
+import java.util.Scanner
+
+const val THRESHOLD = 60
+
+fun main(args: Array<String>) {
+	val reader = Scanner(System.`in`)
+
+	while (true) {
+		val n: Int = reader.nextInt()
+		if (n == 0) break
+
+		var ranks = IntArray(n)
+		var points = ArrayList<Point>()
+		repeat(n) { i ->
+			points.add(Point(i, reader.nextInt(), reader.nextInt()))
+		}
+
+		points.sort()
+
+		findRank(ranks, points)
+
+		println(ranks.joinToString(separator = " "))
+	}
+
+	reader.close()
+}
+
+fun <T> MutableList<T>.insertFrom(index: Int, to: Int) {
+	if (index == to) return
+	val tmp = this[index]
+	this.removeAt(index)
+	this.add(if (index > to) to else to - 1, tmp)
+}
+
+fun findRank(ranks: IntArray, points: MutableList<Point>) : List<Point> {
+	if (points.size <= 1) return points
+	if (points.size <= THRESHOLD) {
+		repeat(points.size) {
+			if (it == 0) return@repeat
+
+			val currentPoint = points[it]
+			if (currentPoint.y < points[0].y) {
+				points.insertFrom(it, to = 0)
+				return@repeat
+			}
+
+			var i = it
+			while (true) {
+				if (currentPoint.y >= points[i - 1].y) break;
+				--i
+			}
+			points.insertFrom(it, to = i)
+			ranks[currentPoint.i] += i
+		}
+		return ArrayList<Point>(points)
+	}
+
+	val leftPoints = findRank(ranks, points.subList(0, points.size / 2))
+	val rightPoints = findRank(ranks, points.subList(points.size / 2, points.size))
+	var resultPoints = ArrayList<Point>()
+
+	var l: Int = 0
+	var r: Int = 0
+	while (true) {
+		if (leftPoints[l].y <= rightPoints[r].y) {
+			resultPoints.add(leftPoints[l++])
+			if (l == leftPoints.size) {
+				rightPoints.listIterator(r).forEach {
+					ranks[it.i] += l
+					resultPoints.add(it)
+				}
+				break
+			}
+		} else {
+			resultPoints.add(rightPoints[r])
+			ranks[rightPoints[r++].i] += l
+			if (r == rightPoints.size) {
+				resultPoints.addAll(leftPoints.subList(l, leftPoints.size))
+				break
+			}
+		}
+	}
+
+	return resultPoints
+}
+
+data class Point(val i: Int, val x: Int = 0, val y: Int = 0) : Comparable<Point> {
+	override fun compareTo(other: Point) : Int = if (this.x == other.x) this.y.compareTo(other.y) else this.x.compareTo(other.x)
+}