Compilare: main.cpp: In function 'std::vector<int> comb(std::vector<int>, std::vector<int>)': main.cpp:11:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=a.size();i++) d[i][0]=d[i-1][0]+i*c[a[i-1]]; ~^~~~~~~~~~ main.cpp:12:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=b.size();j++) d[0][j]=d[0][j-1]+j*c[b[j-1]]; ~^~~~~~~~~~ main.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=a.size();i++) for(j=1;j<=b.size();j++) ~^~~~~~~~~~ main.cpp:13:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=a.size();i++) for(j=1;j<=b.size();j++) ~^~~~~~~~~~