代码:
#include <stdio.h>
int main( )
{
int a,b;
while (scanf("%d%d",&a,&b) == 2){
printf("%d\n",2*a*b);
}
return 0;
}
代码:
#include <stdio.h>
int main( )
{
int a,b;
while (scanf("%d%d",&a,&b) == 2){
printf("%d\n",2*a*b);
}
return 0;
}