ll@n,@q,x[n+1]{},c[n+1]{};rep(i,n){ll@a;x[i+1]=x[i]+a;c[i+1]=c[i]+a*(a+1)/2;}rep(q){ll@s;if(c[n]<s){wt(-1);}else{ll l=lower_bound(c,c+n+1,s)-c-1;wt(x[l]+int(sqrt(2*(s-c[l]))+.5));}}