From 793c779e687f3ecf2aa4365dfc35a71b326da29d Mon Sep 17 00:00:00 2001 From: Nat Lasseter Date: Mon, 4 Dec 2023 09:30:35 +0000 Subject: Day 03 --- day03/day03.java | 110 +++++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 78 insertions(+), 32 deletions(-) (limited to 'day03') diff --git a/day03/day03.java b/day03/day03.java index 4d4caa9..b9f8ecd 100644 --- a/day03/day03.java +++ b/day03/day03.java @@ -4,36 +4,6 @@ import java.util.ArrayList; import java.util.regex.Pattern; import java.util.regex.Matcher; -class Number { - int row, colstart, colend, value; - - public Number(int row, int colstart, int colend, int value) { - this.row = row; - this.colstart = colstart; - this.colend = colend; - this.value = value; - } - - public String toString() { - return "[" + this.row + ", " + this.colstart + "-" + this.colend + "]: " + this.value; - } -} - -class Symbol { - int row, col; - String symbol; - - public Symbol(int row, int col, String symbol) { - this.row = row; - this.col = col; - this.symbol = symbol; - } - - public String toString() { - return "[" + this.row + ", " + this.col + "]: " + this.symbol; - } -} - public class day03 { public static void main(String args[]) throws IOException { RandomAccessFile input = new RandomAccessFile("input", "r"); @@ -82,6 +52,52 @@ public class day03 { return Integer.toString(tot); } + public static String part2(RandomAccessFile input) throws IOException { + String line; + int row = 0; + ArrayList numbers = new ArrayList<>(); + ArrayList symbols = new ArrayList<>(); + + while ((line = input.readLine()) != null) { + getNumbers(numbers, row, line); + getSymbols(symbols, row, line); + row += 1; + } + + int tot = 0; + for (Symbol sym : symbols) { + if (!sym.symbol.equals("*")) { + continue; + } + + ArrayList neighs = new ArrayList<>(); + + for (Number num: numbers) { + if (num.contains(sym.row - 1, sym.col - 1) || + num.contains(sym.row - 1, sym.col ) || + num.contains(sym.row - 1, sym.col + 1) || + num.contains(sym.row , sym.col - 1) || + num.contains(sym.row , sym.col + 1) || + num.contains(sym.row + 1, sym.col - 1) || + num.contains(sym.row + 1, sym.col ) || + num.contains(sym.row + 1, sym.col + 1)) { + if (!neighs.contains(num)) { + neighs.add(num); + } + } + } + + if (!(neighs.size() == 2)) { + continue; + } + + int ratio = neighs.get(0).value * neighs.get(1).value; + tot += ratio; + } + + return Integer.toString(tot); + } + private static void getNumbers(ArrayList numbers, int row, String line) { Pattern pat = Pattern.compile("\\d+"); Matcher mat = pat.matcher(line); @@ -110,8 +126,38 @@ public class day03 { ); } } +} - public static String part2(RandomAccessFile input) throws IOException { - return "WIP"; +class Number { + int row, colstart, colend, value; + + public Number(int row, int colstart, int colend, int value) { + this.row = row; + this.colstart = colstart; + this.colend = colend; + this.value = value; + } + + public boolean contains(int row, int col) { + return (row == this.row) && (this.colstart <= col && col <= this.colend); + } + + public String toString() { + return "[" + this.row + ", " + this.colstart + "-" + this.colend + "]: " + this.value; + } +} + +class Symbol { + int row, col; + String symbol; + + public Symbol(int row, int col, String symbol) { + this.row = row; + this.col = col; + this.symbol = symbol; + } + + public String toString() { + return "[" + this.row + ", " + this.col + "]: " + this.symbol; } } -- cgit v1.2.1