- 由于 vector 重载了 = 运算符，所以我们可以方便的初始化。此外从 C++11 起 vector 还支持 列表初始化，例如：
typedef pair<int,int> pii;
vector<pii>body[]=
{
{{3,1},{3,2},{3,4},{3,5},{1,3},{2,3},{4,3},{5,3}},
{{4,1},{4,2},{4,3},{4,4},{4,5},{5,3},{6,2},{6,3},{6,4}},
{{3,2},{2,2},{1,2},{0,2}},
{{3,4},{2,4},{1,4},{0,4}},
{{3,2},{4,2},{5,2},{3,4},{4,4},{5,4}},
{{1,2},{1,3},{1,4},{2,1},{2,3},{2,5},{3,1},{3,2},{3,4},{3,5},{4,1},{4,3},{4,5},{5,2},{5,3},{5,4}}
};
