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(7 * 4 * (9 * 4 * 5 * 2)) + (8 + 2) * 4 * (3 + 8) +(5 * 8 * (2 + 7 * 2) * (6 + 4 * 9 * 8 + 3 + 2) * 7) * 8 +(8 * (5 * 2 + 5 * 4 + 4) + 8) * 4 * 4 * (6 + 6) + 7 + 9 +(7 * 2 + 2 + 9 + 7) * ((6 + 5) * 3) + (2 * 4 + (8 * 7 * 9 * 7) + 5 + 6 * 9) + 3 + 4 + 2 +5 + 7 + 4 +4 + 8 * 6 * (9 + 4 * 6 + (9 * 8) + 5) +4 + 9 * 2 +2 + (7 * 7 * 2 + 2 * 3 + (6 + 9 * 7 * 4)) + 5 * 4 +(5 + 9 * 9) * 3 * 2 + 5 + 6 +(3 * 6 + 5 + 8) * 9 + 9 * 7 * 3 + 7 +((7 * 5 + 9 + 8 * 8) * 5 * 2 * 7) + (2 + 8 + 5) * 3 \ No newline at end of file diff --git a/2020.csproj b/2020.csproj index 590b5b5..ddb8a35 100644 --- a/2020.csproj +++ b/2020.csproj @@ -56,6 +56,9 @@ PreserveNewest + + PreserveNewest + diff --git a/Program.cs b/Program.cs index c57c53e..315b98f 100644 --- a/Program.cs +++ b/Program.cs @@ -20,6 +20,7 @@ Q13.Go(); Q14.Go(); Q15.Go(); + Q18.Go(); Util.Log($"Total time={(System.DateTime.Now - start).TotalMilliseconds}ms"); } } diff --git a/Q18.cs b/Q18.cs new file mode 100644 index 0000000..608d159 --- /dev/null +++ b/Q18.cs @@ -0,0 +1,176 @@ +using System; +using System.Collections.Generic; +using System.IO; + +namespace _2020 +{ + class Q18 + { + static List list = new List(); + + public static void Go() + { + var start = DateTime.Now; + MakeList(); + Util.Log($"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($"Q18 took {(DateTime.Now - start).TotalMilliseconds}ms"); + } + + static void MakeList() + { + list = new List(File.ReadAllLines("18input.txt")); + } + + static long DoOp(long left, long right, char op) + { + switch (op) + { + case '+': + return left + right; + + case '*': + return left * right; + + default: + throw new Exception("unrecognized op"); + } + } + + static void Part1() + { + long sum = 0; + for (int i = 0; i < list.Count; i++) + { + var evals = new Stack(); + var ops = new Stack(); + long currVal = 0; + char currOp = '+'; + + foreach (var ch in list[i]) + { + if (ch == ' ') + { + continue; + } + else if (ch == '+' || ch == '*') + { + currOp = ch; + } + else if (ch == '(') + { + ops.Push(currOp); + evals.Push(currVal); + currVal = 0; + currOp = '+'; + } + else if (ch == ')') + { + var lastOp = ops.Pop(); + var lastVal = evals.Pop(); + currVal = DoOp(currVal, lastVal, lastOp); + } + else + { + var val = ch - '0'; + currVal = DoOp(currVal, val, currOp); + } + } + + sum += currVal; + } + + Util.Log($"Q18Part1: sum={sum}"); + } + + static long SolveAddPrecedence(string exp) + { + var evals = new Stack(); + var ops = new Stack(); + 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 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}"); + } + } +}