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   "source": [
    "https://leetcode.com/problems/find-all-duplicates-in-an-array\n",
    "\n",
    "\n",
    "Runtime: 140 ms, faster than 20.20% of C++ online submissions for Find All Duplicates in an Array.\n",
    "Memory Usage: 46.6 MB, less than 7.04% of C++ online submissions for Find All Duplicates in an Array.\n",
    "\n",
    "\n",
    "```c++\n",
    "#include <vector>\n",
    "#include <algorithm>\n",
    "#include <map>\n",
    "#include <string>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "class Solution {\n",
    "public:\n",
    "    vector<int> findDuplicates(vector<int>& nums) {\n",
    "        map<int,int> m;\n",
    "        vector<int> l;\n",
    "        for (auto n : nums) {\n",
    "            if (m.find(n) != m.end()) {\n",
    "                m[n] += 1;\n",
    "                l.push_back(n);\n",
    "            } else {\n",
    "                m.insert(pair<int, int>{n, 1});\n",
    "            }\n",
    "        }\n",
    "        return l;\n",
    "    }\n",
    "};\n",
    "```"
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