Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (u = 0; u < graf[v].size(); u++) { ~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < graf[topSort[i]].size(); j++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:33:15: warning: unused variable ‘newV’ [-Wunused-variable] int i, j, newV; ^~~~