Java | simple one
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution {\n    public int[] separateDigits(int[] nums) {\n        List<Integer> l=new ArrayList<>();\n        \n        for(int i:nums)\n        {\n            for(char c:String.valueOf(i).toCharArray()){\n                l.add(c-\'0\');\n            }\n        }\n        int res[]=new int[l.size()];\n        int k=0;\n        for(int i:l){\n            res[k++]=i;\n        }\n        return res;\n        \n    }\n}\n```
['Java']