DSA · Theory

Polish and Reverse Polish Notation

Theory

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Polish and Reverse Polish Notation

Polish and Reverse Polish Notation is a DSA idea you prove with Polish and Reverse Polish Notation on Riya's board, not with a slogan.

For Polish and Reverse Polish Notation, Big-O is in play. Don’t blame it until you have traced Polish and Reverse Polish Notation on Riya's board.

Polish and Reverse Polish Notation exists so Riya can keep Polish and Reverse Polish Notation on Riya's board correct in a campus project.

Riya ships Polish and Reverse Polish Notation in a campus project. That is the use case worth saying.

Don’t do this with Polish and Reverse Polish Notation: copy-pasting Polish and Reverse Polish Notation without a dry-run. Interviewers spot it in ten seconds.

After Polish and Reverse Polish Notation, Riya should still remember copy-pasting Polish and Reverse Polish Notation without a dry-run.

One breath for Polish and Reverse Polish Notation, then Polish and Reverse Polish Notation on Riya's board, then copy-pasting Polish and Reverse Polish Notation without a dry-run. Sit down.

Exam tip

Board: Polish and Reverse Polish Notation on Riya's board. Dry-run Polish and Reverse Polish Notation. Name the trap: copy-pasting Polish and Reverse Polish Notation without a dry-run.

Example

def demo(n):
    # O(1)
    x = n + 1
    # O(n)
    total = sum(range(n))
    # O(n^2)
    pairs = 0
    for i in range(n):
        for j in range(n):
            pairs += 1
    return x, total, pairs

print(demo(3))

Polish and Reverse Polish Notation — big-O describes how work grows with input size — ignore constants.

Short notes

DefPolish and Reverse Polish Notation — Riya uses it for Polish and Reverse Polish Notation on Riya's board in a campus project.
RulePolish and Reverse Polish Notation → one Polish and Reverse Polish Notation step Riya can write from memory.
RememberPolish and Reverse Polish Notation + Big-O (a campus project).
UsePolish and Reverse Polish Notation in a campus project (Polish and Reverse Polish Notation on Riya's board).
TrapPolish and Reverse Polish Notation — copy-pasting Polish and Reverse Polish Notation without a dry-run.
ExPolish and Reverse Polish Notation → Polish and Reverse Polish Notation on Riya's board.

def demo(n): # O(1) x = n + 1 # O(n) total = sum(range(n)) # O(n^2) pairs = 0 for i in range(n): for j in range(n): pairs += 1 return x, total, pairs print(demo(3))

Polish and Reverse Polish Notation

Example

Short notes

Questions

Polish and Reverse Polish Notation

Example

Short notes

Questions