Compilare: user.cpp: In function ‘void DFS(short int, short int)’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[st].size();++i) ^ user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[dr].size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) ^ user.cpp:55:9: warning: unused variable ‘k’ [-Wunused-variable] int k=0; ^