Compilare: user.cpp: In function ‘void solve()’: user.cpp:111:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<filled[nrfilled].size();i++) ^ user.cpp:117:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[stare].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:191:26: warning: unused variable ‘j’ [-Wunused-variable] int nrtest=0,valid,i,j; ^