refactor: minor refactor to day 2

Author: Flashky

src/main/java/com/adventofcode/flashk/day02/RedNosedReports.java

@@ -10,25 +10,11 @@ public RedNosedReports(List<String> inputs) {
         reports = inputs.stream().map(Report::new).toList();
     }
 
-    public int solveA() {
-        int result = 0;
-        for(Report report : reports) {
-            if(report.isSafe()) {
-                result++;
-            }
-        }
-
-        return result;
+    public long solveA() {
+        return reports.stream().filter(Report::isSafe).count();
     }
 
-    public int solveB() {
-        int result = 0;
-        for(Report report : reports) {
-            if(report.isSafeDampener()) {
-                result++;
-            }
-        }
-
-        return result;
+    public long solveB() {
+        return reports.stream().filter(Report::isSafeDampener).count();
     }
 }

src/main/java/com/adventofcode/flashk/day02/Report.java

@@ -25,27 +25,20 @@ public boolean isSafe() {
         boolean expectedIncreasing = isIncreasing();
         boolean isSafe = true;
 
-        int i = 1;
-        int lastLevel = levels.get(0);
+        Iterator<Integer> iterator = levels.iterator();
+        int previousLevel = iterator.next();
 
-        while(isSafe && i < levels.size()) {
-            int currentLevel = levels.get(i);
-            int distance = currentLevel-lastLevel;
+        while(isSafe && iterator.hasNext()) {
+            int currentLevel = iterator.next();
+            int distance = currentLevel-previousLevel;
 
-            if(distance == 0) {
+            if((distance == 0) ||
+                ((expectedIncreasing) && (distance > 3 || distance < 0)) ||
+                ((!expectedIncreasing) && (distance < -3 || distance > 0))) {
                 isSafe = false;
-            } else if(expectedIncreasing) {
-                if(distance > 3 || distance < 0) {
-                    isSafe = false;
-                }
-            } else {
-                if(distance < -3 || distance > 0) {
-                    isSafe = false;
-                }
             }
 
-            lastLevel = currentLevel;
-            i++;
+            previousLevel = currentLevel;
         }
 
         return isSafe;
@@ -74,11 +67,7 @@ public boolean isSafeDampener() {
 
         return isSafe;
     }
-    /**
-     * true si creciente
-     * false si decreciente;
-     * @return
-     */
+
     private boolean isIncreasing() {
         int i = 0;
         boolean found = false;