卡常模板，必背

 1 #pragma GCC optimize(1)
 2 #pragma GCC optimize(2)
 3 #pragma GCC optimize(3)
 4 #include<iostream>
 5 #include<cstdio>
 6 #include<ctime>
 7 #include<cstdlib>
 8 #include<cstring>
 9 #include<algorithm>
10 #define Ri register int  
11 #define sswap(x,y) x^=y^=x^=y;
12
 
 template <class T> T mmin(T x,T y){return(x)<(y)?(x):(y);}
13 template <class T> T mmax(T x,T y){return(x)<(y)?(y):(x);}
14 template <class T> T lowbit(T x){return ((x)&(-(x)));}
15 typedef long long ll;
16 using namespace std;
17 namespace io{
18     const int MT=5e7;
19
 
     char buf[MT];ll c,sz;
20     void begin(){c=0;sz=fread(buf,1,MT,stdin);}
21     template<class T>
22     inline bool read(T &t) 
23     {
24         while(c<sz&&buf[c]!=‘-‘&&(buf[c]<‘0‘||buf[c]>‘9‘))c++;
25         if(c>=sz)return false;
26         bool flag=0;if
 
(buf[c]==‘-‘)flag=1,c++;
27         for(t=0;c<sz&&‘0‘<=buf[c]&&buf[c]<=‘9‘;c++)t=t*10+buf[c]-‘0‘;
28         if(flag==1)t=-t;return true;
29     }
30 }
31 template <typename _TpInt>
32 inline void write(_TpInt x)
33 {
34     if (x<0){
35         putchar(‘-‘);
36         write<_TpInt>(~x+1);
37     }
38     else {
39         if (x>9)write<_TpInt>(x/10);   
40         putchar(x%10+‘0‘);
41     }
42 }
43 template <typename _ll>
44 inline void ...(_ll x)
45 {...}
46 int main(void)
47 {
48     io::begin();
49     io::read();
50     write();
51 }
52  

卡常模板