problems(java): add “1662. Check If Two String Arrays are Equivalent”

Signed-off-by: Matej Focko <mfocko@redhat.com>

problems/java/check-if-two-string-arrays-are-equivalent.java

@@ -0,0 +1,27 @@
+class Solution {
+    public boolean arrayStringsAreEqual(String[] word1, String[] word2) {
+        int i = 0, ii = 0;
+        int j = 0, jj = 0;
+
+        while (i < word1.length && j < word2.length) {
+            if (word1[i].charAt(ii) != word2[j].charAt(jj)) {
+                return false;
+            }
+
+            ++ii;
+            ++jj;
+
+            if (ii >= word1[i].length()) {
+                ++i;
+                ii = 0;
+            }
+
+            if (jj >= word2[j].length()) {
+                ++j;
+                jj = 0;
+            }
+        }
+
+        return i == word1.length && j == word2.length && ii == 0 && jj == 0;
+    }
+}