java: add «2191. Sort the Jumbled Numbers»

Signed-off-by: Matej Focko <me@mfocko.xyz>

java/sort-the-jumbled-numbers.java

@@ -0,0 +1,35 @@
+class Solution {
+  private class Jumble {
+    public int original;
+    public int mapped;
+
+    public Jumble(int[] mapping, int original) {
+      this.original = original;
+      map(mapping, original);
+    }
+
+    private void map(int[] mapping, int original) {
+      mapped = mapping[original % 10];
+      original /= 10;
+
+      for (int power = 10; original > 0; power *= 10, original /= 10) {
+        mapped += power * mapping[original % 10];
+      }
+    }
+  }
+
+  public int[] sortJumbled(int[] mapping, int[] nums) {
+    var jumbled = new Jumble[nums.length];
+    for (int i = 0; i < nums.length; ++i) {
+      jumbled[i] = new Jumble(mapping, nums[i]);
+    }
+
+    Arrays.sort(jumbled, Comparator.comparing(k -> ((Jumble) k).mapped));
+
+    for (int i = 0; i < nums.length; ++i) {
+      nums[i] = jumbled[i].original;
+    }
+
+    return nums;
+  }
+}