Can you please help me in debugging this Solution.
I first build a static array prefix[0..n] where each prefix[j] counts how many of the originally given d[k] (for 1≤k≤j) were already 1, treating every input value of –1 or 0 as contributing 0. Next, I build a segment tree over the array of upper‐limits r[1..n], so that a query ST.query(i, n) returns the index j∈[i..n] whose r[j] is minimal, breaking any ties by choosing the rightmost such index. Then I sweep i from 1 to n: if d[i] was already 0 or 1, I simply add it to my current height; if d[i] == –1, I let j = ST.query(i,n) and set prevSum = prefix[j], and compare crr + prevSum versus r[j]: if crr + prevSum < r[j], I choose d[i] = 1 (incrementing crr and height by 1), otherwise d[i] = 0. After each assignment, I check that the new height still lies in [ℓ[i], r[i]]; if it ever goes outside, I print –1 and stop, and if the loop finishes successfully, I output the final d[1..n].
