Compilare: user.cpp: In function ‘int main()’: user.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L.size();++j) ^ user.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L.size();++i) sort(L[i].Y.begin(),L[i].Y.end(),comp); ^ user.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L.size();++i) ^ user.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L[i].Y.size();++j) d[j]=1; ^ user.cpp:53:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<L[i].Y.size();++j) ^ user.cpp:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L[i].Y.size();++j) ans[i]=max(ans[i],d[j]); ^ user.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L.size();++i) ^