Compilare: main.cpp: In function 'int main()': main.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int x = 0; x < v.size(); x++) | ~~^~~~~~~~~~ main.cpp:51:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (int y = x + 1; y < v.size(); y++) | ~~^~~~~~~~~~ main.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int j = 0; j < v.size(); j++) | ~~^~~~~~~~~~