输入外挂模板

 1 namespace IO {
 2     const int MX = 4e7; //1e7占用内存11000kb
 3     char buf[MX]; int c, sz;
 4     void begin() {
 5         c = 0;
 6         sz = fread(buf, 1, MX, stdin);
 7     }
 8     inline bool read(int &t) {
 9         while(c < sz && buf[c] != '-' && (buf[c] < '0' || buf[c] > '9')) c++;
10         if(c >= sz) return false;
11         bool flag = 0; if(buf[c] == '-') flag = 1, c++;
12         for(t = 0; c < sz && '0' <= buf[c] && buf[c] <= '9'; c++) t = t * 10 + buf[c] - '0';
13         if(flag) t = -t;
14         return true;
15     }
16 }