Compilare: main.cpp: In function 'int main()': main.cpp:23:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pereche>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i=0;i<d1.size();++i) | ~^~~~~~~~~~ main.cpp:30:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pereche>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i=0;i<d2.size();++i) | ~^~~~~~~~~~