Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:46:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <graph[vertex].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:92:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol[i].size();j++) ^ user.cpp:67:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^