Create Count Common Words With One Occurrence.java

Author: varunu28

Easy/Count Common Words With One Occurrence.java

@@ -0,0 +1,16 @@
+class Solution {
+  public int countWords(String[] words1, String[] words2) {
+    Map<String, int[]> map = new HashMap<>();
+    buildFrequencyMap(words1, map, 0);
+    buildFrequencyMap(words2, map, 1);
+    return (int) map.entrySet().stream()
+        .filter(entry -> entry.getValue()[0] == 1 && entry.getValue()[1] == 1)
+        .count();
+  }
+
+  private void buildFrequencyMap(String[] words, Map<String, int[]> map, int idx) {
+    for (String word : words) {
+      map.computeIfAbsent(word, k -> new int[2])[idx]++;
+    }
+  }
+}