Compilare: main.cpp: In function 'int main()': main.cpp:31:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int j = 0; j < d.size() - 1; j++) { | ~~^~~~~~~~~~~~~~ main.cpp:32:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int l = j + 1; l < d.size(); l++) { | ~~^~~~~~~~~~