java: add “1897. Redistribute Characters to Make All Strings Equal”

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

java/redistribute-characters-to-make-all-strings-equal.java

@@ -0,0 +1,21 @@
+class Solution {
+    public boolean makeEqual(String[] words) {
+        int[] counters = new int[26];
+
+        for (String w : words) {
+            for (int i = 0; i < w.length(); ++i) {
+                ++counters[w.charAt(i) - 'a'];
+            }
+        }
+
+        int N = words.length;
+        for (int count : counters) {
+            if (count % N != 0) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}
+