Depth and level of tree
Let's look at an example:
4️⃣ - > Level = 0
/ \
3️⃣ 5️⃣ - > Level = 1
/ \ / \
1️⃣ 2️⃣ 6️⃣ 7️⃣ - > Level = 2
The level is the depth of a set of nodes in a tree.
Depth of a tree is the maximum depth of a node in the tree
4️⃣ - > Depth = 0
/ \
3️⃣ 5️⃣ - > Depth = 1
/ \ / \
1️⃣ 2️⃣ 6️⃣ 7️⃣ - > Depth = 2
3
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