Compilare: main.cpp: In function 'void topo(int)': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void rezolva()': main.cpp:35:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<S.size();i++) ~^~~~~~~~~ main.cpp:38:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[u].size();j++) ~^~~~~~~~~~~~ main.cpp:33:12: warning: unused variable 'w' [-Wunused-variable] int i,j,u,w; ^