Merge pull request #1194 from t3chkid/main

Add solution for 853. Car Fleet in Kotlin

Author: dissesmac

Diff for: kotlin/853-Car-Fleet.kt

@@ -0,0 +1,21 @@
+class Solution {
+    fun carFleet(target: Int, position: IntArray, speed: IntArray): Int {
+        val sortedPairs = position
+            .zip(speed)
+            .sortedBy { (position, _) -> position }
+        var numberOfFleets = 1
+        var timeRequiredForCarInFrontToReachInTarget =
+            (target - sortedPairs[sortedPairs.lastIndex].first) / sortedPairs[sortedPairs.lastIndex].second.toFloat()
+        var timeRequiredForCurrentCarToReachTarget: Float
+        for (i in (sortedPairs.lastIndex - 1) downTo 0) {
+            timeRequiredForCurrentCarToReachTarget = (target - sortedPairs[i].first) / sortedPairs[i].second.toFloat()
+            if (timeRequiredForCurrentCarToReachTarget > timeRequiredForCarInFrontToReachInTarget) {
+                // the current car requires more time to reach the destination
+                // than the car in front of it.
+                numberOfFleets++
+                timeRequiredForCarInFrontToReachInTarget = timeRequiredForCurrentCarToReachTarget
+            }
+        }
+        return numberOfFleets
+    }
+}