Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[nod].size(); ++i) ^ user.cpp:27:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!v[ gr[nod][i] ].cod) ^ user.cpp: In function ‘int main()’: user.cpp:69:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<sol[i].size(); ++j) ^ user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<sol[i].size(); ++j) ^