大佬的几行fastIO

namespace io {
  const int SIZE = 1e6;
  char buff[SIZE];
  char *l = buff, *r = buff;
  void init() {
    l = buff;
    r = l + fread(buff, 1, SIZE, stdin);
  }
  char gc() {
    if (l == r) init();
      return *(l++);
  }
  void read(int &x) {
    x = 0;
    char ch = gc();
    while(!isdigit(ch)) ch = gc();
    while(isdigit(ch)) x = x * 10 + ch - '0', ch = gc();
  }
}using io::read;

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