easy short fast solution
\nPLEASE UPVOTE IF YOU LIKE\n\n```\n        int[] arr = new int[1001];\n\n        for (int i = 0; i <nums.length; i++) {\n            for (int j = 0; j < nums[i
```\nPLEASE UPVOTE IF YOU LIKE\n```\n```\n        int[] arr = new int[1001];\n\n        for (int i = 0; i <nums.length; i++) {\n            for (int j = 0; j < nums[i].length; j++) {\n                arr[ nums[i][j] ]++;\n            }\n        }\n\n        List<Integer> ans = new ArrayList<>();\n        for (int i = 1; i < arr.length; i++) {\n            if (arr[i] == nums.length){\n                ans.add(i);\n            }\n        }\n        return ans;
['Java']