下面为测试代码：
1.创建
std::vector< std::vector<string> > vc2;
2.初始化
std::vector<string> vc;
vc.push_back("v11");
vc.push_back("v12");
vc.push_back("v13"); std::vector<string> v2;
v2.push_back("v21");
v2.push_back("v22");
v2.push_back("v23"); std::vector<string> v3;
v3.push_back("v21");
v3.push_back("v22");
v3.push_back("v23"); vc2.push_back(vc);
vc2.push_back(v2);
vc2.push_back(v3);
3.执行删除操作
for (std::vector<std::vector<string> >::iterator i = vc2.begin(); i != vc2.end();) {
for (std::vector<string>::iterator j = i->begin(); j != i->end(); ) {
j = i->erase(j);
}
i = vc2.erase(i);
}
