Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:31:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ok>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i = 0; i < adj[nod].size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int, int)': main.cpp:58:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ok>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int i = 0; i < adj[nod].size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:103:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ok>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for (j = 0; j < adj[a[i]].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:154:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ok>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 154 | for (j = 0; j < adj[a[i]].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:26:16: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] 26 | if (viz[nod] == 0) | ~~~~~~~^ main.cpp:102:17: note: 'start' was declared here 102 | int start; | ^~~~~