(kotlin) day 7 wip

07/input

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+Step B must be finished before step G can begin.
+Step G must be finished before step J can begin.
+Step J must be finished before step F can begin.
+Step U must be finished before step Z can begin.
+Step C must be finished before step M can begin.
+Step Y must be finished before step I can begin.
+Step Q must be finished before step A can begin.
+Step N must be finished before step L can begin.
+Step O must be finished before step A can begin.
+Step Z must be finished before step T can begin.
+Step I must be finished before step H can begin.
+Step L must be finished before step W can begin.
+Step F must be finished before step W can begin.
+Step T must be finished before step X can begin.
+Step A must be finished before step X can begin.
+Step K must be finished before step X can begin.
+Step S must be finished before step P can begin.
+Step M must be finished before step E can begin.
+Step E must be finished before step W can begin.
+Step D must be finished before step P can begin.
+Step P must be finished before step W can begin.
+Step X must be finished before step H can begin.
+Step V must be finished before step W can begin.
+Step R must be finished before step H can begin.
+Step H must be finished before step W can begin.
+Step N must be finished before step I can begin.
+Step X must be finished before step R can begin.
+Step D must be finished before step V can begin.
+Step V must be finished before step R can begin.
+Step F must be finished before step K can begin.
+Step P must be finished before step R can begin.
+Step P must be finished before step V can begin.
+Step S must be finished before step X can begin.
+Step I must be finished before step S can begin.
+Step J must be finished before step N can begin.
+Step T must be finished before step S can begin.
+Step T must be finished before step R can begin.
+Step K must be finished before step P can begin.
+Step N must be finished before step R can begin.
+Step G must be finished before step T can begin.
+Step I must be finished before step V can begin.
+Step G must be finished before step Q can begin.
+Step D must be finished before step H can begin.
+Step V must be finished before step H can begin.
+Step T must be finished before step K can begin.
+Step T must be finished before step W can begin.
+Step E must be finished before step H can begin.
+Step C must be finished before step R can begin.
+Step L must be finished before step K can begin.
+Step G must be finished before step Y can begin.
+Step Y must be finished before step O can begin.
+Step O must be finished before step E can begin.
+Step U must be finished before step S can begin.
+Step X must be finished before step W can begin.
+Step C must be finished before step D can begin.
+Step E must be finished before step P can begin.
+Step B must be finished before step R can begin.
+Step F must be finished before step R can begin.
+Step A must be finished before step D can begin.
+Step G must be finished before step M can begin.
+Step B must be finished before step Q can begin.
+Step Q must be finished before step V can begin.
+Step B must be finished before step W can begin.
+Step S must be finished before step H can begin.
+Step P must be finished before step X can begin.
+Step I must be finished before step M can begin.
+Step A must be finished before step S can begin.
+Step M must be finished before step X can begin.
+Step L must be finished before step S can begin.
+Step S must be finished before step W can begin.
+Step L must be finished before step V can begin.
+Step Z must be finished before step X can begin.
+Step M must be finished before step R can begin.
+Step T must be finished before step A can begin.
+Step N must be finished before step V can begin.
+Step M must be finished before step H can begin.
+Step E must be finished before step D can begin.
+Step F must be finished before step V can begin.
+Step B must be finished before step O can begin.
+Step G must be finished before step U can begin.
+Step J must be finished before step C can begin.
+Step G must be finished before step F can begin.
+Step Y must be finished before step M can begin.
+Step F must be finished before step D can begin.
+Step M must be finished before step P can begin.
+Step F must be finished before step T can begin.
+Step G must be finished before step A can begin.
+Step G must be finished before step Z can begin.
+Step K must be finished before step V can begin.
+Step J must be finished before step Z can begin.
+Step O must be finished before step Z can begin.
+Step B must be finished before step E can begin.
+Step Z must be finished before step V can begin.
+Step Q must be finished before step O can begin.
+Step J must be finished before step D can begin.
+Step Y must be finished before step E can begin.
+Step D must be finished before step R can begin.
+Step I must be finished before step F can begin.
+Step M must be finished before step V can begin.
+Step I must be finished before step D can begin.
+Step O must be finished before step P can begin.

07/main.kt

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+import java.io.File
+import java.io.InputStream
+
+fun main(args: Array<String>) {
+    val inputStream = File("input").inputStream()
+    val inputLines = inputStream.bufferedReader().use { it.readText() }.split("\n")
+    var map: HashMap<Char, HashSet<Char>> = HashMap()
+    for (line in inputLines) {
+        val step = line[36]
+        val dep = line[5]
+
+        // Make sure values that are only referenced as dependencies
+        // (i. e. the first step in our chain) are also added to the set.
+        map.getOrPut(dep, { HashSet<Char>() })
+
+        val currentDeps = map.getOrPut(step, { HashSet<Char>() })
+        currentDeps.add(dep)
+    }
+    for (entry in map) {
+        println(entry)
+    }
+    while (map.size > 0) {
+        val candidatesForNext = map.entries.map{a -> Pair(a.key, a.value.size)}//.map{e -> Pair(e.1, e.2.size()}
+        println(candidatesForNext)
+    }
+}