Day part 1

day-7/Main.java

@@ -0,0 +1,70 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Collectors;
+
+public class Main {
+
+    static class Test {
+
+        public long result;
+        public List<Integer> values;
+
+        Test(long r, List<Integer> v) {
+            this.result = r;
+            this.values = v;
+        }
+
+        boolean testIt() {
+            int possibleCombinations = (int) Math.pow(2, this.values.size());
+
+            for (int i = 0; i < possibleCombinations; i++) {
+                long newResult = this.values.get(0);
+                String out = "" + newResult;
+                for (int j = 1; j < this.values.size(); j++) {
+                    if ((i >> j) % 2 == 0) {
+                        newResult += this.values.get(j);
+                    } else {
+                        newResult *= this.values.get(j);
+                    }
+                }
+                if (newResult == this.result) {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+
+    static ArrayList<Test> parseInput() {
+        ArrayList<Test> output = new ArrayList<Test>();
+        try {
+            File input = new File("input.txt");
+            Scanner reader = new Scanner(input);
+            while (reader.hasNextLine()) {
+                String data = reader.nextLine();
+                String[] parts = data.split(":");
+                long result = Long.valueOf(parts[0]);
+                List<Integer> values = Arrays.asList(parts[1].trim().split(" "))
+                    .stream()
+                    .map(s -> Integer.parseInt(s))
+                    .collect(Collectors.toList());
+                output.add(new Test(result, values));
+            }
+            reader.close();
+        } catch (FileNotFoundException e) {
+            System.out.println("Ups...");
+        }
+        return output;
+    }
+
+    public static void main(String args[]) {
+        ArrayList<Test> tests = parseInput();
+        tests.removeIf(t -> !t.testIt());
+        long total = tests.stream().mapToLong(t -> t.result).sum();
+        System.out.println(total);
+    }
+}

readme.md

@@ -8,7 +8,8 @@ Día 2: Zig
 Día 3: Bash  
 Día 4: LibreOffice Calc  
 Día 5: Julia  
-Día 6: Javascript
+Día 6: Javascript  
+Día 7: Java
 
 
 Lenguajes por usar:
@@ -18,7 +19,7 @@ Lenguajes por usar:
 1. ~~Julia~~
 1. C++
 1. PHP
-1. Java
+1. ~~Java~~
 1. Ruby
 1. ~~Javascript~~
 1. ~~LibreOffice Calc~~