STL的vector的三种简单初始化方式

（1）第一种，类似于数组的方式：

 std::vector strArray(10);
 strArray[0] = "hello";
 strArray[1] = "world";
 strArray[2] = "this";
 strArray[3] = "find";
 strArray[4] = "gank";
 strArray[5] = "pink";
 strArray[6 ]= "that";
 strArray[7] = "when";
 strArray[8] = "how";
 strArray[9] = "cpp";

（2）push_back的方式：

 vector strArray;
 strArray.push_back("hello");
 strArray.push_back("world");
 strArray.push_back("this");
 strArray.push_back("find");
 strArray.push_back("gank");
 strArray.push_back("pink");
 strArray.push_back("that");
 strArray.push_back("when");
 strArray.push_back("how");
 strArray.push_back("cpp");

（3）构造函数的方式：

 string str[]={"hello","world","this","find","gank","pink","that","when","how","cpp"};
 vector strArray(str, str+10);