输入输出挂

namespace fastIO { 
    #define BUF_SIZE 100000 
    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 == '
' || ch == '
' || ch == '	'; 
    } 
    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'); 
    } 
    #undef BUF_SIZE 
}; 
using namespace fastIO;