alazyreader/AdventOfCode2025
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use reducers instead of foreach

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This commit is contained in:
David
2025-12-04 22:30:22 -05:00
parent 1aeeaa780e
commit b13e847401
1 changed files with 15 additions and 26 deletions
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41
src/Day04.java
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@@ -9,10 +9,9 @@ import java.util.Scanner;
public class Day04 {
private static int neighbors = 0;
private static int score = 0;
private static int round = 0;
private static Map<String, Boolean> floor = new java.util.HashMap<>();
private static Map<String, Integer> floor = new java.util.HashMap<>();
public static void main(String[] args) {
Instant start = Instant.now();
@@ -37,25 +36,20 @@ public class Day04 {
for (int i = 0; i < size; i++) {
String key = "%s-%s".formatted(i, rowIndex);
if (row[i].equals("@")) {
floor.put(key, true);
} else {
floor.put(key, false);
floor.put(key, 1);
}
}
rowIndex++;
}
floor.forEach((key, value) -> {
if (value) {
if (value == 1) {
String[] coords = key.split("-");
int x = Integer.parseInt(coords[0]);
int y = Integer.parseInt(coords[1]);
neighbors = 0;
generateNeighborKeys(x, y).forEach((coord) -> {
if (floor.getOrDefault(coord, false)) {
neighbors += 1;
}
});
int neighbors = generateNeighborKeys(x, y).stream().reduce(
0,
(t, coord) -> (t + floor.getOrDefault(coord, 0)),
Integer::sum);
if (neighbors < 4) {
score += 1;
}
@@ -79,30 +73,25 @@ public class Day04 {
for (int i = 0; i < size; i++) {
String key = "%s-%s".formatted(i, rowIndex);
if (row[i].equals("@")) {
floor.put(key, true);
} else {
floor.put(key, false);
floor.put(key, 1);
}
}
rowIndex++;
}
while (true) {
Map<String, Boolean> newFloor = new java.util.HashMap<>(floor);
Map<String, Integer> newFloor = new java.util.HashMap<>(floor);
floor.forEach((key, value) -> {
if (value) {
if (value == 1) {
String[] coords = key.split("-");
int x = Integer.parseInt(coords[0]);
int y = Integer.parseInt(coords[1]);
neighbors = 0;
generateNeighborKeys(x, y).forEach((coord) -> {
if (floor.getOrDefault(coord, false)) {
neighbors += 1;
}
});
int neighbors = generateNeighborKeys(x, y).stream().reduce(
0,
(t, coord) -> (t + floor.getOrDefault(coord, 0)),
Integer::sum);
if (neighbors < 4) {
round += 1;
newFloor.put(key, false);
newFloor.put(key, 0);
}
}
});