#include <vector>
#include <algorithm>
#include <iostream>
 
struct Node
{
    int x;
    int y;
    float value;
};
 
int main() {
    std::vector<Node> vec {
        {5, 6, 0.f}, {2, 4, 0.f}, {1, 1, 0.f}, {1, 0, 0.f}, {8, 10, 0.f}, {4, 7, 0.f},
        {7, 1, 0.f}, {5, 4, 0.f}, {6, 1, 0.f}, {1, 4, 0.f}, {3, 10, 0.f}, {7, 2, 0.f}
    };
 
    std::sort(std::begin(vec), std::end(vec), [](const Node& a, const Node& b) {
        return a.y < b.y || (a.y == b.y && a.x < b.x);
    });
 
    std::cout << "x y" << std::endl << std::endl;
    for (auto const &n : vec)
        std::cout << n.x << " " << n.y << std::endl;
}
 

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