Add solutions for problems 1684, 2413, 3280, and 3289

Author: DarkSnakeX

src/main/java/me/darksnakex/problems/p1684.java

@@ -0,0 +1,24 @@
+package me.darksnakex.problems;
+
+public class p1684 {
+
+    public int countConsistentStrings(String allowed, String[] words) {
+
+       int res = 0;
+
+        for (String word : words) {
+            String pal = word;
+            for (int j = 0; j < allowed.length(); j++) {
+                pal = pal.replaceAll(String.valueOf(allowed.charAt(j)), "");
+            }
+            if (pal.isEmpty()) {
+                res++;
+            }
+        }
+
+       return res;
+
+
+    }
+
+}

src/main/java/me/darksnakex/problems/p2413.java

@@ -0,0 +1,16 @@
+package me.darksnakex.problems;
+
+public class p2413 {
+
+    public int smallestEvenMultiple(int n) {
+
+        for(double i = 2; i<n*10; i++){
+            if(i % 2 == 0 && (i/n)%1 == 0){
+                return (int)i;
+            }
+        }
+        return n;
+
+    }
+
+}

src/main/java/me/darksnakex/problems/p3280.java

@@ -0,0 +1,16 @@
+package me.darksnakex.problems;
+
+public class p3280 {
+
+    public String convertDateToBinary(String date) {
+
+        int anio = Integer.parseInt(date.substring(0,4));
+        int mes =  Integer.parseInt(date.substring(5,7));
+        int dia = Integer.parseInt(date.substring(8,10));
+
+
+        return Integer.toBinaryString(anio)+"-"+Integer.toBinaryString(mes)+"-"+Integer.toBinaryString(dia);
+
+    }
+
+}

src/main/java/me/darksnakex/problems/p3289.java

@@ -0,0 +1,40 @@
+package me.darksnakex.problems;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class p3289 {
+
+    public int[] getSneakyNumbers(int[] nums) {
+
+        Map<Integer,Integer> map = new HashMap<>();
+
+        int val1=-1;
+        int val2=-1;
+        for (int num : nums) {
+            if (!map.containsKey(num)) {
+                map.put(num, 1);
+            } else {
+                map.put(num, map.get(num) + 1);
+            }
+
+        }
+        for (int valor : map.keySet()) {
+            if((map.get(valor))== 2){
+                if(val1 == -1){
+                    val1 = valor;
+                } else if (val2 == -1) {
+                    val2 =  valor;
+                }
+                else{
+                    break;
+                }
+            }
+
+        }
+
+        return new int[]{val1,val2};
+
+    }
+
+}