Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[x].size(); i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void DFST(int)’: user.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<atrans[x].size(); i++) ~^~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:37:18: warning: unused variable ‘j’ [-Wunused-variable] int i, x, y, j; ^