【转】数据输入加速

1 //适用于正整数
2 template <class T>
3 inline void scan_d(T &ret) {
4     char c; ret=0;
5     while((c=getchar())<'0'||c>'9');
6     while(c>='0'&&c<='9') ret=ret*10+(c-'0'),c=getchar();
7 }

 1 //适用于正负整数
 2 template <class T>
 3 inline bool scan_d(T &ret) {
 4    char c; int sgn;
 5    if(c=getchar(),c==EOF) return 0; //EOF
 6    while(c!='-'&&(c<'0'||c>'9')) c=getchar();
 7    sgn=(c=='-')?-1:1;
 8    ret=(c=='-')?0:(c-'0');
 9    while(c=getchar(),c>='0'&&c<='9') ret=ret*10+(c-'0');
10    ret*=sgn;
11    return 1;
12 }

 1 //适用于正负数,(int,long long,float,double)
 2 template <class T>
 3 bool scan_d(T &ret){
 4     char c; int sgn; T bit=0.1;
 5     if(c=getchar(),c==EOF) return 0;
 6     while(c!='-'&&c!='.'&&(c<'0'||c>'9')) c=getchar();
 7     sgn=(c=='-')?-1:1;
 8     ret=(c=='-')?0:(c-'0');
 9     while(c=getchar(),c>='0'&&c<='9') ret=ret*10+(c-'0');
10     if(c==' '||c=='\n'){ ret*=sgn; return 1; }
11     while(c=getchar(),c>='0'&&c<='9') ret+=(c-'0')*bit,bit/=10;
12     ret*=sgn;
13     return 1;
14 }

inline void out(int x) {
   if(x>9) out(x/10);
   putchar(x%10+'0');
}

　　转自：http://blog.csdn.net/shahdza/article/details/6317011