[JAVA] 3LINES // BEATS 100.00% MEMORY/SPEED 0ms // APRIL 2022
\nclass Solution {\n public List<Integer> intersection(int[][] aa){\n        int[] counts = new int[1_001];\n        Arrays.stream(aa).forEach(a -> Arrays.strea
```\nclass Solution {\n public List<Integer> intersection(int[][] aa){\n        int[] counts = new int[1_001];\n        Arrays.stream(aa).forEach(a -> Arrays.stream(a).forEach(n -> counts[n]++));\n        return IntStream.range(0, counts.length).filter(n -> counts[n] == aa.length).boxed().collect(Collectors.toList());\n    }\n}\n```\n\n***Consider upvote if useful!***
['Java']