int main() {
vector<int> cost_sam(3, -1);
cost_sam[0] = 10;
cost_sam[1] = 15;
cost_sam[2] = 20;
cout <<((-1) < (cost_sam.size())) << endl;
cout<<(-1<3<<endl;
return 0;
}
为什么第一cout输出0,而第二个cout输出1,cost_sam.size()应该为3才对啊