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:47:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < invers[i].size(); j++ ) ~~^~~~~~~~~~~~~~~~~~ main.cpp:57:12: warning: statement has no effect [-Wunused-value] for ( i; i >= 1; i-- ){ ^ main.cpp:59:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0; j < direct[i].size(); j++ ) ~~^~~~~~~~~~~~~~~~~~