Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int i=0;i<v[x].size();i++) | ~^~~~~~~~~~~~ main.cpp:12:9: warning: unused variable 'i' [-Wunused-variable] 12 | int i; | ^ main.cpp: In function 'void dfs2(int)': 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<inv[x].size();i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:13: warning: unused variable 'nod' [-Wunused-variable] 60 | int nod = nr[i]; | ^~~ main.cpp:71:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (int j=0;j<sal[i].size();j++) | ~^~~~~~~~~~~~~~