c++ 快速读入

Posted 2022-12-20 wzy-sky

 1 inline read()
 2 
 3     int s = 0, w = 1;
 4     char ch = getchar();
 5     while (ch < ‘0‘ || ch > ‘9‘)    
 6         if (ch == ‘-‘)    w = -1;
 7         ch = getchar();
 8     while (ch >= ‘0‘ && ch <= ‘9‘)        
 9             s  = s << 3 + s << 1 + ch - ‘0‘;
10              ch = getchar();
11     
12     return s * w;
13        

调用如下

int main()

    int a, b;
    a = read(), b = read();