Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v[x].size() ; i++) ^ user.cpp:28:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:57:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < sol.size() ; i++) ^ user.cpp:44:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x ,y, t; ^