【模板】快速读入

 1 inline int read()
 2 {
 3     int p = 1, a = 0;
 4     char c = getchar();
 5     while(c < ‘0‘ || c > ‘9‘)
 6     {
 7         if(c == ‘-‘) p = -1;
 8         c = getchar();
 9     }
10     while(c >= ‘0‘ && c <= ‘9‘)
11     {
12         a = a * 10 + c - ‘0‘;
13         c = getchar();
14     }
15     return a * p;
16 }