inta[50001];intf1[50001][20],f2[50001][20];inlinevoidwork1(){ for(inti=1;i<=n;i++) f1[i][0]=a[i]; for(intj=1;(1<<j)<=n;j++) for(inti=1;i+(1<<j)-1<=n;i++) f1[i][j]=max(f1[i][j-1],f1[