Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[x].size();j++) ^ user.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[x].size();j++) ^ user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[x].size();j++) ^ user.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[x].size();j++) ^ user.cpp:28:17: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (ok1==true && ok2==true || ok1==true && ok3==true || ok2==true && ok3==true) ^ user.cpp:28:69: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (ok1==true && ok2==true || ok1==true && ok3==true || ok2==true && ok3==true) ^