Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for ( int i = 0; i < adj[c].size(); i ++ ) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int append(int, int)': main.cpp:33:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for ( int i = 0; i < adj[c].size(); i ++ ) | ~~^~~~~~~~~~~~~~~ main.cpp:39:1: warning: no return statement in function returning non-void [-Wreturn-type] 39 | } | ^ main.cpp: In function 'int main()': main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for ( int i = 0; i < lista.size(); i ++ ) | ~~^~~~~~~~~~~~~~ main.cpp:58:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for ( int i = 0; i < mapa[idx].size(); i ++ ) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int append(int, int)': main.cpp:29:5: warning: infinite recursion detected [-Winfinite-recursion] 29 | int append( int c, int root ) | ^~~~~~ main.cpp:37:19: note: recursive call 37 | append( l, root ); | ~~~~~~^~~~~~~~~~~