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comparison 2017/day08/app.d @ 33:bc652fa0a645

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Move all solutions to per-day subdirs
author Jordi Gutiérrez Hermoso <jordigh@octave.org>
date Tue, 09 Jan 2018 21:50:37 -0500
parents 2017/day08.d@7d06d033b0ee
children 1d99d733cf13
comparison
equal deleted inserted replaced
32:763c88851b91 33:bc652fa0a645
1 import std.algorithm: max, maxElement;
2 import std.regex;
3 import std.stdio;
4 import std.conv: to;
5
6 int[string] registers;
7 int maxSoFar = 0;
8
9 bool function(int,int)[string] comparisons;
10 static foreach(cmp; ["<", ">", "==", "<=", ">=", "!="]) {
11 comparisons[cmp] = mixin("function(int a, int b) => a "~cmp~" b");
12 }
13
14 void evalInstruction(string line) {
15 static instructionRegex = regex(
16 r"(?P<reg>\w+) (?P<op>inc|dec) (?P<amt>-?\d+) "
17 ~ r"if (?P<condreg>\w+) (?P<comp>[=<>!]{1,2}) (?P<amtcond>-?\d+)"
18 );
19 auto row = matchFirst(line, instructionRegex);
20 if(comparisons[row["comp"]](
21 registers.get(row["condreg"], 0),
22 to!int(row["amtcond"]))){
23 if(row["op"] == "inc") {
24 registers[row["reg"]] = registers.get(row["reg"], 0) + to!int(row["amt"]);
25 }
26 else if(row["op"] == "dec") {
27 registers[row["reg"]] = registers.get(row["reg"], 0) - to!int(row["amt"]);
28 }
29 }
30 maxSoFar = max(maxSoFar, registers.values.maxElement);
31 }
32
33 void main(string[] args) {
34
35 foreach(line; File(args[1]).byLineCopy) {
36 evalInstruction(line);
37 }
38 writeln(registers.values.maxElement);
39 writeln(maxSoFar);
40 }