IO加速

namespace IStream{      const int L=1<<15;      char buffer[L],*S,*T;      inline char Get_Char()      {          if(S==T)          {              T=(S=buffer)+fread(buffer,1,L,stdin);              if(S==T) return EOF;          }          return *S++;      }      inline int gint()      {          char c;          int re=0;          for(c=Get_Char();c<'0'||c>'9';c=Get_Char());          while(c>='0'&&c<='9')              re=(re<<1)+(re<<3)+(c-'0'),c=Get_Char();          return re;      }  }namespace IO{    char buf[1<<15],*fs,*ft;    inline char gc(){return (fs==ft&&(ft=(fs=buf)+fread(buf,1,1<<15,stdin),fs==ft))?0:*fs++;}    inline int gi(){        int x=0,rev=0,ch=gc();        while(ch<'0'||ch>'9'){if(ch=='-')rev=1;ch=gc();}        while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+ch-'0';ch=gc();}        return rev?-x:x;    }}