读入挂

Posted 2023-02-03

可以加快一点读入速度，本地测试需要加读写文件

Code：

namespace fastIO 
    #define BUF_SIZE 100000
    //fread -> read
    bool IOerror = 0;
    inline char nc() 
        static char buf[BUF_SIZE], *p1 = buf + BUF_SIZE, *pend = buf + BUF_SIZE;
        if(p1 == pend) 
            p1 = buf;
            pend = buf + fread(buf, 1, BUF_SIZE, stdin);
            if(pend == p1) 
                IOerror = 1;
                return -1;
            
        
        return *p1++;
    
    inline bool blank(char ch) 
        return ch ==   || ch == \\n || ch == \\r || ch == \\t;
    
    inline void read(int &x) 
        char ch;
        while(blank(ch = nc()));
        if(IOerror)
            return;
        for(x = ch - 0; (ch = nc()) >= 0 && ch <= 9; x = x * 10 + ch - 0);
    
    inline void readll(long long int &x) 
        char ch;
        while(blank(ch = nc()));
        if(IOerror)
            return;
        for(x = ch - 0; (ch = nc()) >= 0 && ch <= 9; x = x * 10 + ch - 0);
    
    #undef BUF_SIZE
;