Compilare: main.cpp: In function 'bool pairup(int)': main.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i=0; i<vecini[nod].size(); i++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp:28:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int i=0; i<vecini[nod].size(); i++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] 38 | } | ^