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    "https://leetcode.com/problems/most-common-word\n",
    "\n",
    "\n",
    "Runtime: 28 ms, faster than 5.79% of C++ online submissions for Most Common Word.\n",
    "Memory Usage: 18.4 MB, less than 6.26% of C++ online submissions for Most Common Word.\n",
    "\n",
    "\n",
    "\n",
    "```c++\n",
    "#include <vector>\n",
    "#include <algorithm>\n",
    "#include <string>\n",
    "#include <regex>\n",
    "#include <iostream>\n",
    "#include <map>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "bool compare(pair<string,int> &a, pair<string,int> &b) {\n",
    "    return a.second > b.second;\n",
    "}\n",
    "\n",
    "char myToLower(char c) {\n",
    "    return tolower(c);\n",
    "}\n",
    "\n",
    "class Solution\n",
    "{\n",
    "public:\n",
    "    string mostCommonWord(string paragraph, vector<string> &banned)\n",
    "    {\n",
    "        //6:02\n",
    "        map<string, int> d;\n",
    "\n",
    "        std::regex word_regex(\"(\\\\w+)\");\n",
    "        auto words_begin =\n",
    "            std::sregex_iterator(paragraph.begin(), paragraph.end(), word_regex);\n",
    "        auto words_end = std::sregex_iterator();\n",
    "        for (std::sregex_iterator i = words_begin; i != words_end; ++i)\n",
    "        {\n",
    "            std::smatch match = *i;\n",
    "            std::string match_str = match.str();\n",
    "            transform(match_str.begin(), match_str.end(), match_str.begin(), myToLower);\n",
    "            if (d.find(match_str) == d.end()) {\n",
    "                d.insert(pair<string,int> {match_str, 1});\n",
    "            } else {\n",
    "                d[match_str] += 1;\n",
    "            }\n",
    "        }\n",
    "\n",
    "        vector<pair<string,int>> arr;\n",
    "        for (auto &it: d) {\n",
    "            arr.push_back(it);\n",
    "        }\n",
    "\n",
    "        sort(arr.begin(), arr.end(), compare);\n",
    "\n",
    "        for (auto &it: arr) {\n",
    "            if (find(banned.begin(), banned.end(), it.first) == banned.end()) {\n",
    "                return it.first;\n",
    "            }\n",
    "        }\n",
    "\n",
    "        return \"yingshaoxo\";\n",
    "        //6:36\n",
    "    }\n",
    "};\n",
    "```"
   ]
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