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+((7 * 5 + 9 + 8 * 8) * 5 * 2 * 7) + (2 + 8 + 5) * 3

2020.csproj

@@ -56,6 +56,9 @@
     <None Update="15input.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="18input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>

Program.cs

@@ -20,6 +20,7 @@
          Q13.Go();
          Q14.Go();
          Q15.Go();
+         Q18.Go();
          Util.Log($"Total time={(System.DateTime.Now - start).TotalMilliseconds}ms");
       }
    }

Q18.cs

@@ -0,0 +1,176 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace _2020
+{
+   class Q18
+   {
+      static List<string> list = new List<string>();
+
+      public static void Go()
+      {
+         var start = DateTime.Now;
+         MakeList();
+         Util.Log($"Q18 MakeList took {(DateTime.Now - start).TotalMilliseconds}ms");
+         var p1start = DateTime.Now;
+         Part1();
+         Util.Log($"Q18 part1 took {(DateTime.Now - p1start).TotalMilliseconds}ms");
+         var p2start = DateTime.Now;
+         Part2();
+         Util.Log($"Q18 part2 took {(DateTime.Now - p2start).TotalMilliseconds}ms");
+
+         Util.Log($"Q18 took {(DateTime.Now - start).TotalMilliseconds}ms");
+      }
+
+      static void MakeList()
+      {
+         list = new List<string>(File.ReadAllLines("18input.txt"));
+      }
+
+      static long DoOp(long left, long right, char op)
+      {
+         switch (op)
+         {
+            case '+':
+               return left + right;
+
+            case '*':
+               return left * right;
+
+            default:
+               throw new Exception("unrecognized op");
+         }
+      }
+
+      static void Part1()
+      {
+         long sum = 0;
+         for (int i = 0; i < list.Count; i++)
+         {
+            var evals = new Stack<long>();
+            var ops = new Stack<char>();
+            long currVal = 0;
+            char currOp = '+';
+
+            foreach (var ch in list[i])
+            {
+               if (ch == ' ')
+               {
+                  continue;
+               }
+               else if (ch == '+' || ch == '*')
+               {
+                  currOp = ch;
+               }
+               else if (ch == '(')
+               {
+                  ops.Push(currOp);
+                  evals.Push(currVal);
+                  currVal = 0;
+                  currOp = '+';
+               }
+               else if (ch == ')')
+               {
+                  var lastOp = ops.Pop();
+                  var lastVal = evals.Pop();
+                  currVal = DoOp(currVal, lastVal, lastOp);
+               }
+               else
+               {
+                  var val = ch - '0';
+                  currVal = DoOp(currVal, val, currOp);
+               }
+            }
+
+            sum += currVal;
+         }
+
+         Util.Log($"Q18Part1: sum={sum}");
+      }
+
+      static long SolveAddPrecedence(string exp)
+      {
+         var evals = new Stack<long>();
+         var ops = new Stack<char>();
+         long currVal = 0;
+         char currOp = '+';
+         var numStr = "";
+
+         foreach (var ch in exp)
+         {
+            if (ch == ' ')
+            {
+               if (!string.IsNullOrEmpty(numStr))
+               {
+                  currVal = DoOp(currVal, Convert.ToInt32(numStr), currOp);
+                  numStr = "";
+               }
+               continue;
+            }
+            else if (ch == '+' || ch == '*')
+            {
+               currOp = ch;
+               if (ch == '*')
+               {
+                  ops.Push(currOp);
+                  evals.Push(currVal);
+                  currVal = 0;
+                  currOp = '+';
+               }
+            }
+            else
+            {
+               numStr += ch;
+            }
+         }
+
+         if (!string.IsNullOrEmpty(numStr))
+         {
+            currVal = DoOp(currVal, Convert.ToInt32(numStr), currOp);
+         }
+
+         return currVal;
+      }
+
+      static void Part2()
+      {
+         long sum = 0;
+         for (int i = 0; i < list.Count; i++)
+         {
+            long currVal = 0;
+
+            var expressions = new Stack<string>();
+            string currExp = "";
+
+            foreach (var ch in list[i])
+            {
+               if (ch == '(')
+               {
+                  expressions.Push(currExp);
+                  currExp = "";
+               }
+               else if (ch == ')')
+               {
+                  var subVal = SolveAddPrecedence(currExp);
+                  currExp = expressions.Pop();
+                  currExp += subVal;
+               }
+               else
+               {
+                  currExp += ch;
+               }
+            }
+
+            if (!string.IsNullOrEmpty(currExp))
+            {
+               currVal = SolveAddPrecedence(currExp);
+            }
+
+            sum += currVal;
+         }
+
+         Util.Log($"Q18Part2: sum={sum}");
+      }
+   }
+}