Add day10 problem + solution

day10/p2.nim

@@ -0,0 +1,54 @@
+import os
+import std/[strformat, algorithm]
+
+proc mapClosing(open: char): char {.inline.} =
+  case open:
+  of '(': ')'
+  of '[': ']'
+  of '{': '}'
+  of '<': '>'
+  else: '\0'
+
+proc points(c: char): int {.inline.} =
+  case c:
+  of ')': 1
+  of ']': 2
+  of '}': 3
+  of '>': 4
+  else: 0
+
+proc main() =
+  let fileName = paramStr(1)
+
+  var pointList: seq[int]
+
+  for line in fileName.lines:
+    var stack: seq[char]
+
+    var points = 0
+    var error = false
+    for c in line:
+      case c:
+      of '[', '(', '{', '<':
+        stack.add(c)
+      of ']', ')', '}', '>':
+        if mapClosing(stack[^1]) == c:
+          discard stack.pop()
+        else:
+          echo fmt"Syntax error. Got {c}, expected {mapClosing(stack[^1])}"
+          error = true
+          break
+      else: discard
+
+    while not error and stack.len > 0:
+      points *= 5
+      points += mapClosing(stack.pop).points
+
+    if not error:
+      pointList.add points
+
+
+
+  echo "Points: ", pointList.sorted[pointList.len div 2]
+
+main()