Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<gr[x].size();i++) ~^~~~~~~~~~~~~ main.cpp:13:20: warning: unused variable 't' [-Wunused-variable] int i,ok=0,nod,t,k; ^ main.cpp:13:22: warning: unused variable 'k' [-Wunused-variable] int i,ok=0,nod,t,k; ^ main.cpp: In function 'void dfsdin(int)': main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<fii[x].size();i++) ~^~~~~~~~~~~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<fii[x].size();i++) ~^~~~~~~~~~~~~~ main.cpp:32:11: warning: variable 'ok' set but not used [-Wunused-but-set-variable] int i,ok=0,nod,t,k; ^~