[2023] Fix edge cases for day 3

Author: kfarnung

2023/day03/src/main/java/com/github/kfarnung/adventofcode/aoc2023/day03/App.java

@@ -41,7 +41,9 @@ public static String getPart1(List<String> lines) {
                     for (Part symbol : findSymbols(rows, i, j)) {
                         symbols.add(symbol);
                     }
-                } else {
+                } 
+                
+                if (!Character.isDigit(c) || j == row.size() - 1) {
                     if (!symbols.isEmpty()) {
                         total += Integer.parseInt(sb.toString());
                     }
@@ -74,7 +76,9 @@ public static String getPart2(List<String> lines) {
                             symbols.add(symbol);
                         }
                     }
-                } else {
+                } 
+                
+                if (!Character.isDigit(c) || j == row.size() - 1) {
                     for (Part symbol : symbols) {
                         symbolMap.computeIfAbsent(symbol, k -> new ArrayList<>()).add(Integer.parseInt(sb.toString()));
                     }

2023/day03/src/test/java/com/github/kfarnung/adventofcode/aoc2023/day03/AppTest.java

@@ -13,41 +13,45 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 class AppTest {
+    private final List<String> testInput = Arrays.asList(
+            "467..114..",
+            "...*......",
+            "..35..633.",
+            "......#...",
+            "617*......",
+            ".....+.58.",
+            "..592.....",
+            "......755.",
+            "...$.*....",
+            ".664.598..");
+
+    private final List<String> testInput2 = Arrays.asList(
+            "467..114..",
+            "...*......",
+            "..35...633",
+            "4.....#...",
+            "617*......",
+            ".....+.58.",
+            "..592.....",
+            "......755.",
+            "...$..*...",
+            ".664...598");
+
     @Test
     void testGetPart1() throws IOException {
-        List<String> lines = Arrays.asList(
-                "467..114..",
-                "...*......",
-                "..35..633.",
-                "......#...",
-                "617*......",
-                ".....+.58.",
-                "..592.....",
-                "......755.",
-                "...$.*....",
-                ".664.598..");
-        assertEquals("4361", App.getPart1(lines));
-
-        lines = readLinesFromResources(this, "input.txt");
-        assertEquals("512794", App.getPart1(lines));
+        assertEquals("4361", App.getPart1(testInput));
+        assertEquals("4361", App.getPart1(testInput2));
+
+        List<String> realInput = readLinesFromResources(this, "input.txt");
+        assertEquals("512794", App.getPart1(realInput));
     }
 
     @Test
     void testGetPart2() throws IOException {
-        List<String> lines = Arrays.asList(
-                "467..114..",
-                "...*......",
-                "..35..633.",
-                "......#...",
-                "617*......",
-                ".....+.58.",
-                "..592.....",
-                "......755.",
-                "...$.*....",
-                ".664.598..");
-        assertEquals("467835", App.getPart2(lines));
-
-        lines = readLinesFromResources(this, "input.txt");
-        assertEquals("67779080", App.getPart2(lines));
+        assertEquals("467835", App.getPart2(testInput));
+        assertEquals("467835", App.getPart2(testInput2));
+
+        List<String> realInput = readLinesFromResources(this, "input.txt");
+        assertEquals("67779080", App.getPart2(realInput));
     }
 }