Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:34:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=0; i<graf[nod].size(); i++) | ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i=0; i<graf[nod].size(); i++) | ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:121:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for(int i=0; i<sol.size(); i++) | ~^~~~~~~~~~~