Compilare: main.cpp: In function 'void dfs(int)': main.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < invers[node].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < invers[ a[i] ].size(); j++ ) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:53:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < direct[ a[i] ].size(); j++ ) ~~^~~~~~~~~~~~~~~~~~~~~~~