为什么这两个东西结果不一样

	for(int i=1;i<=n;++i){
		if((long long)t[i].a+t[i].b+s1[i-1]+s2[i+1]<0) cout<<666<<endl;
		ans=min(ans,(long long)t[i].a+t[i].b+s1[i-1]+s2[i+1]);
	}  

	for(int i=1;i<=n;++i){
		if((long long)t[i].a+t[i].b+s1[i-1]+s2[i+1]<0) cout<<666<<endl;
		ans=min(ans,(long long)(t[i].a+t[i].b+s1[i-1]+s2[i+1]));
	} 

前一个是对的后一个会爆 longlong