Compilare: user.cpp: In function ‘int main()’: user.cpp:32:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[j].size();++k) if(i&(1<<v[j][k])) d[i][j]=min(d[i][j],d[i^(1<<j)][v[j][k]]+c[v[j][k]][j]); ^ user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[0].size();++i) sol=min(sol,d[(1<<n)-1][v[0][i]]+c[v[0][i]][0]); ^