代码

#include<cstdio>
using namespace std;
long long x,y;
char BuF[1<<26],*InF=BuF;
template<typename T>void read(T &x){
	bool f=1;
	for(;47>*InF||*InF>58;f^=*InF++=='-');
	for(x=0;47<*InF&&*InF<58;x=(x<<3)+(x<<1)+(*InF++^48));
	x=f?x:-x;
}

int main(){
	fread(BuF,1,1<<26,stdin);
	read(x);read(y);
	printf("%lld",x*y-x-y);
	fclose(stdin);
	fclose(stdout);
	return(0);
}

评测结果