Compilare: main.cpp: In function 'int dfs(int)': main.cpp:17:25: 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 < adj[root].size();++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:82:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp: In function 'bool check(int)': main.cpp:39:23: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized] 39 | return ret == cs; | ^~ main.cpp:29:13: note: 'ret' was declared here 29 | int ret; | ^~~ main.cpp: In function 'int main()': main.cpp:86:17: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized] 86 | if(check(n)) | ^~ main.cpp:29:13: note: 'ret' was declared here 29 | int ret; | ^~~