the difference easy hard version length string you hack problem solve but hack previous problem solve problemsKirk binary string s string consist zeroes one length n ask find binary string t length satisfie follow condition for l r 1 leq l leq r leq n length long nondecrease subsequence substre s_ls_l1 ldot s_r equal length long nondecrease subsequence substre t_lt_l1 ldot t_r the number zero t maximum possibleA nondecrease subsequence stre p sequence index i_1 i_2 ldot i_k i_1 i_2 ldot i_k p_i_1 leq p_i_2 leq ldot leq p_i_k the length subsequence kIf multiple substring satisfy condition output