快读快输模板

 1 #include "bits/stdc++.h"
 2 using namespace std;
 3 typedef long long ll;
 4 inline ll read()//内联函数可以节省调用的开销，而且能够便于编译器和上下文配合做优化
 5 {
 6     ll s = 0,w = 1;
 7     char ch = getchar();
 8     while(ch < '0' || ch > '9'){
 9         if(ch == '-') w = -1;
10         ch = getchar();
11     }
12     while(ch >= '0' && ch <= '9'){
13         s = (s << 1) + (s << 3) + (ch ^ 48);//== s  * 10 + ch - '0';位运算快一点
14         ch = getchar();
15     }
16     return s * w;
17 }
18 inline void write(ll x)
19 {
20     if(x < 0) putchar('-'),x = -x;
21     if(x > 9) write(x / 10);
22     putchar(x % 10 + '0');
23 }
24 int main()
25 {
26     int k;
27     k = read();
28     write(k);
29 }