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Construct a BST from a given sequence of values

#1
10-25-2023, 05:06 AM
You grab the first number from your sequence right away. It turns into the root of your tree without any fuss. You then pick up the next value in line. You check if it sits smaller or bigger than what you have already. Smaller ones swing left while bigger ones swing right.

You keep repeating this step for every fresh value that shows up. Each comparison starts at the root and drops down a path until an empty spot appears. I see you nodding because this builds the whole structure based purely on order. The first item always claims the top spot no matter what comes later. Later items twist the branches in ways that surprise you sometimes.

Perhaps the sequence runs in perfect sorted order from start to finish. Then your tree stretches out like a straight chain leaning one way. You lose balance fast and searches crawl along the length. But mix up the numbers a bit and branches spread wider. I watch your tree stay shorter when values scatter around the middle often.

Or you hit a case where duplicates appear in the flow. You decide early if equals go left or right to avoid fights. Most times you push them one side to keep rules clean. Then the shape stays predictable even with repeats. You test this by feeding the same sequence twice and comparing results.

Now imagine reversing the whole sequence before you begin. The root stays the same yet every branch flips around completely. You end up with a mirror image that still works for searches. I find this trick handy when you want to test different layouts quick. But the original order always dictates the final twist.

You also notice empty spots matter a lot during growth. An early small value claims left space and blocks later ones from squeezing in. Bigger values after that push right instead. I see your tree grow lopsided if the first half stays tiny. Later big values then stretch the opposite side far.

Perhaps you wonder about speed when the sequence grows huge. Each new value walks down a path that gets longer in bad cases. You count steps roughly equal to the height at that moment. Balanced spreads keep steps few while chains make you wait. I tell you to watch the height after every few inserts.

Then you try splitting the sequence into parts to build subtrees first. You pick a middle value as root and split the rest around it. Left parts feed the left branch while right parts feed the right. This gives better shape from the start compared to plain order. But you still follow the original sequence rules unless you reorder first.

You compare two sequences with the same numbers yet different positions. One creates a bushy form while the other stays skinny. I point out the bushy one finds items faster every time. Skinny ones force long walks down single lines. Your choice of feeding order changes everything without extra work.

Also consider what happens if you remove a value later. The tree must heal the gap without breaking search rules. You pull the smallest from the right side to fill holes. This keeps order intact but shifts more branches around. I notice you practice this on small trees before big ones.

You feed another sequence that starts with a middle value. Branches spread both ways from the first step onward. Later numbers fill gaps on either side without stretching far. I see your height stay low and searches stay quick. The early middle choice acts like a natural balancer.

But a sequence heavy on one end forces long arms early. You end up with many steps to reach the far leaves. I suggest swapping a few items in your mind to fix this. Small changes in order cut the height down fast. Your tree becomes friendlier for repeated lookups after that.

You keep going until every value finds its leaf position. The final shape tells the story of your sequence order. I check the paths with you to confirm rules held. Every left turn stays smaller than the parent above it. Every right turn stays bigger without exception.

Perhaps you want to rebuild from scratch with the same numbers. You start over and notice the tree matches only if order stays identical. Any shuffle creates a new pattern of branches. I enjoy watching how tiny order shifts create big shape changes. Your understanding grows each time you try fresh sequences.

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ProfRon
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Construct a BST from a given sequence of values - by ProfRon - 10-25-2023, 05:06 AM

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Construct a BST from a given sequence of values

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