Nim day 5

day05.nim

+import sequtils, strutils
+
+proc react(polymer: seq[char], skip: char): seq[char] =
+    var count = 0
+    for c in polymer:
+        if c == skip or (ord(c) xor ord(skip)) == 32:
+            continue
+        if count > 0:
+            if (ord(c) xor ord(result[count - 1])) == 32:
+                result.delete(count - 1)
+                count -= 1
+                continue
+        result.add(c)
+        count += 1
+
+let polymer = toSeq(readFile("data/05.txt").strip.items).react(' ')
+
+echo polymer.len
+echo min(toSeq('A'..'Z').map(proc(c: char): int = len(polymer.react(c))))