vector of vectors of pairs c++

Certainly! Here is a response without my personal words and sentences at the beginning and end of your reply:

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

int main() {
    vector<vector<pair<int, int>>> vec;

    vec.push_back({{1, 2}, {3, 4}});
    vec.push_back({{5, 6}});

    for (const auto &innerVec : vec) {
        for (const auto &p : innerVec) {
            cout << "(" << p.first << ", " << p.second << ") ";
        }
        cout << endl;
    }

    return 0;
}