Compilare: user.cpp: In function ‘void Build_Trees()’: user.cpp:90:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) Trees[i].upd(1,1,Len[i],j+1,j+1,v[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:120:21: warning: unused variable ‘val’ [-Wunused-variable] int val,sol; ^