本文中的string类的常用接口可以查询相关的文档进行查看：文档查询
目录
1，vector的遍历
void test_vector1()
{
vector<int>v;
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(5);
//下标+[]
for (size_t i = 0; i < v.size(); i++)
{
//v[i] -= 1;
cout << v[i] << " ";
}
cout << endl;
//迭代器
vector<int>::iterator it = v.begin();
while (it != v.end())
{
*it += 1;
cout << *it << " ";
it++;
}
cout << endl;
//范围for
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
}
int main()
{
test_vector1();
return 0;
}2，其他容器迭代器初始化，只要数据类型可以匹配上
（*iterator 对象的类型跟vector中存的数据类型是一致的）
void test_vector2()
{
string s("hello world");
vector<char>v(s.begin(), s.end());
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
}3，rbegin? &? rend
vector<int>::reverse_iterator rit = v.rbegin();
while (rit != v.rend())
{
cout << *rit << " ";
rit++;
}
cout << endl;4，reverse & resize
void test_vector4()
{
vector<int>v;
//cout << v.max_size() << endl;
v.reserve(10);//开空间，改变容量
//下面这样的用法是错误的——>operator[]中回去检查i是否小于size
//for (size_t i = 0; i < 10; i++)
//{
// v[i] = i;//assert(i<_size)
//}
for (size_t i = 0; i < 10; i++)
{
v.push_back(i);
}
v.resize(20, 1);//开空间+初始化
for (size_t i = 0; i < 20; i++)
{
v[i] = i;
}
}5，assign
void test_vector5()
{
int a[] = { 1, 2, 3, 4, 5 };
vector<int>v;
//[first,last)
v.assign(a, a + 4);
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
}
6，insert?
void test_vector6()
{
int a[] = { 1, 2, 3, 4, 5 };
vector<int>v(a, a + 5);
//头插
v.insert(v.begin(), 0);
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
}假设想在2的前面插入呢？
vector<int>::iterator pos = find(v.begin(), v.end(), 2);
if (pos != v.end())
{
v.insert(pos, 20);
}
for (auto e : v)
{
cout << e << " ";
}
cout << endl;7，sort
//默认排升序
sort(v.begin(), v.end());
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
//排降序—关于greater<int>是一个仿函数
sort(v.begin(), v.end(), greater<int>());
for (auto e : v)
{
cout << e << " ";
}
cout << endl;8，erase
//头删
v.erase(v.begin());
for (auto e : v)
{
cout << e << " ";
}
cout << endl;
//删除pos位置的数
vector<int>::iterator pos = find(v.begin(), v.end(), 2);
if (pos != v.end())
{
v.erase(pos);
}
for (auto e : v)
{
cout << e << " ";
}
cout << endl;