生成下列代码mermaid流程图：template <typename T> bool read_file(string filename,T * table) { char filenames[100]; memset(filenames,'\0',sizeof(filenames)); for(int i = 0; i < filename.length(); i++) filenames[i] = filename[i]; cout<<"filename: "<<filenames<<endl<<endl; fstream file(filenames); //打开文件 string words; if(!file) { cout<<"文件打开失败"<<endl; return 0; } string s; while(getline(file,words)) //逐行读取 { for(int i=0;i<=words.size();i++) { if(words[i]>=65&&words[i]<=90 || words[i]>=97&&words[i]<=122 || words[i]=='_') //A-Z,a-z,_ 是关键字的成分 s.push_back(words[i]); else { int k = Find(s); //二分查找关键字s if(k != -1) { if(typeid(table) == typeid(HashTable *)) //开放地址法 table[hash_found(keyword[k],(HashTable *)table)].num += 1; else if(typeid(table) == typeid(HashNode *)) //链地址法 hash_founds(keyword[k],(HashNode *)table)->num += 1; } s.clear(); } } } file.close(); return 1; }

graph TD;
    A[开始] --> B[初始化filenames数组];
    B --> C[将filename字符串中的字符复制到filenames数组中];
    C --> D[打印filenames数组];
    D --> E[打开文件];
    E --> F[读取文件内容];
    F --> G[逐行读取文件];
    G --> H[处理每一行的内容];
    H --> I[初始化字符串s];
    I --> J[逐个判断单词中的字符];
    J --> |字符为字母或下划线| K[将字符添加到字符串s中];
    K --> L[判断字符串s是否为关键字];
    L --> |是| M[根据表格类型进行计数];
    L --> |否| N[清空字符串s];
    F --> O[关闭文件];
    O --> P[返回结果];