vector<vector<Point>>

vector<vector<Point>>是一个二维的动态数组，其中每个元素是一个Point类型的向量。你可以通过使用vector类来创建和操作它。例如，你可以使用push_back函数将一个Point向量添加到vector<vector<Point>>中。你还可以使用下标或迭代器来访问和遍历这个二维数组的元素。请参考以下代码示例：

#include <iostream>
#include <vector>
using namespace std;

struct Point {
    int x, y;
};

vector<vector<Point>> points;

int main() {
    vector<Point> p1;
    Point d1;
    d1.x = 1;
    d1.y = 2;
    p1.push_back(d1);

    vector<Point> p2;
    Point d2;
    d2.x = 3;
    d2.y = 4;
    p2.push_back(d2);

    points.push_back(p1);
    points.push_back(p2);

    cout << "Number of rows: " << points.size() << endl;
    cout << "Number of columns in the first row: " << points<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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