#include <vector>
#include <algorithm>
#include <iostream>
 
struct CircleInfo
{
	int x, y, radius, weight;
};
 
int main()
{
	std::vector<CircleInfo> circles;
	CircleInfo ci1 = { 1,1,1,1 };
	CircleInfo ci2 = { 3,3,3,3 };
	circles.push_back(ci2);
	circles.push_back(ci1);
	std::cout << "before sort circles[0].radius: " << circles[0].radius << std::endl;
	std::sort(circles.begin(), circles.end(), [](const CircleInfo& c1, const CircleInfo& c2) {
		return c1.radius < c2.radius;
	});
	std::cout << "after sort circles[0].radius: " << circles[0].radius << std::endl;
}
 

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