fastIO模板

 1 namespace fastIO{
 2     #define BUF_SIZE 100000
 3     bool IOerror=0;
 4     inline char nc() {
 5         static char buf[BUF_SIZE],*p1=buf+BUF_SIZE,*pend=buf+BUF_SIZE;
 6         if(p1==pend){
 7             p1=buf;
 8             pend=buf+fread(buf,1,BUF_SIZE,stdin);
 9             if(pend==p1){
10                 IOerror=1;
11                 return -1;
12             }
13         }
14         return *p1++;
15       }
16       inline bool blank(char ch) {
17           return ch==‘ ‘||ch==‘\n‘||ch==‘\r‘||ch==‘\t‘;
18       }
19       inline void read(int &x) {
20           char ch;
21           while(blank(ch=nc()));
22           if(IOerror)    return;
23           for(x=ch-‘0‘;(ch=nc())>=‘0‘&&ch<=‘9‘;x=(x<<3)+(x<<1)+ch-‘0‘);
24       }
25       #undef BUF_SIZE
26   };
27 using namespace fastIO;