tie-sort.cc

#include <iostream>
#include <algorithm>
#include <tuple>
#include <vector>

struct S {
	int x, y, z;
};

int main() {
	std::vector<S> a = {
		{1, 2, 3},
		{1, 2, 4},
		{1, 3, 4},
		{1, 3, 1},
		{2, 2, 3},
		{3, 1, 1},
	};
	
	std::sort(begin(a), end(a),
				[](const S &a, const S &b) -> bool {
					return std::tie(a.x, b.y, a.z) < std::tie(b.x, a.y, b.z);	
				});
				
	for (const auto &e : a)
		std::cout << e.x << " " << e.y << " " << e.z << "\n";
	return 0;
}