#include <iostream>
#include <vector>
#include <utility>
#include <algorithm>
 
int main() {
	std::vector<std::pair<int, int>> vec3 {
		{3, 2},
		{3, 2},
		{3, 2},
		{5, 3},
		{5, 3}
	};
 
	std::sort(vec3.begin(), vec3.end());
	std::vector<std::pair<int, int>> vec4;
 
	size_t i = 0;
	while (i < vec3.size()) {
	    vec4.push_back(vec3[i]);
    	// skip any duplicates
    	while ((++i < vec3.size()) && (vec3[i] == vec3[i-1]));
	}
 
	for(size_t i = 0; i < vec4.size(); ++i) {
	    std::cout << vec4[i].first << ", " << vec4[i].second << std::endl;
	}
 
	return 0;
}

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