Compilare: main.cpp: In function 'void topo(int)': main.cpp:27:19: 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:39:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<S.size(); i++) ~^~~~~~~~~ main.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<g[u].size(); j++) ~^~~~~~~~~~~~ main.cpp:37:15: warning: unused variable 'w' [-Wunused-variable] int i,j,u,w; ^