Compilare: main.cpp: In function 'int main()': main.cpp:41:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int j=0;j<sets[oldset].size();++j) | ~^~~~~~~~~~~~~~~~~~~~ main.cpp:48:18: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wformat=] 48 | printf("%d\n%d\n", ans, mst.size()); | ~^ ~~~~~~~~~~ | | | | int std::vector<std::pair<int, int> >::size_type {aka long unsigned int} | %ld main.cpp:49:18: 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 i=0;i<mst.size();++i) | ~^~~~~~~~~~~