Compilare: user.cpp: In function ‘void backtr(int)’: user.cpp:37:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!viz[i] && graf[i].size()>0 && graf[i].size()<minim){ ^ user.cpp: In function ‘int main()’: user.cpp:114:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<sol.size();i++) ^ user.cpp: In function ‘void backtr(int)’: user.cpp:43:32: warning: ‘poz_min’ may be used uninitialized in this function [-Wmaybe-uninitialized] int b=*graf[poz_min].begin(); ^