Compilare: main.cpp: In function 'void unite(int, int, int&)': main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i=0;i<AAA.size();i++) | ~^~~~~~~~~~~ main.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int j=0;j<BBB.size();j++) | ~^~~~~~~~~~~