Compilare: main.cpp: In function 'int main()': main.cpp:33:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<element>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int i=0; i<v[1].size (); i++) | ~^~~~~~~~~~~~~ main.cpp:45:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<element>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (int j=0; j<v[nod].size (); j++) | ~^~~~~~~~~~~~~~~ main.cpp:57:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<element>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (int j=0; j<l.size (); j++) | ~^~~~~~~~~~