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DSA · Theory

Maximum profit by buying and selling a share at most twice

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Theory

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Maximum profit by buying and selling a share at most twice

Maximum profit by buying and selling a share at most twice is a DSA idea you prove with a Maximum profit by buying and selling a share at most twice dry-run, not with a slogan.

Maximum profit by buying and selling a share at most twice order: meaning → one Maximum profit by buying and selling a share at most twice step Vikram can write from memory → one limit. Dumping ten features helps nobody.

Maximum profit by buying and selling a share at most twice exists so Vikram can keep a Maximum profit by buying and selling a share at most twice dry-run correct in lab hour.

Use Maximum profit by buying and selling a share at most twice when a Maximum profit by buying and selling a share at most twice dry-run must stay clear. If a simpler DSA step works, use that instead.

Don’t do this with Maximum profit by buying and selling a share at most twice: only reciting the name of Maximum profit by buying and selling a share at most twice. Interviewers spot it in ten seconds.

After Maximum profit by buying and selling a share at most twice, Vikram should still remember only reciting the name of Maximum profit by buying and selling a share at most twice.

One breath for Maximum profit by buying and selling a share at most twice, then a Maximum profit by buying and selling a share at most twice dry-run, then only reciting the name of Maximum profit by buying and selling a share at most twice. Sit down.

Exam tip

Board: a Maximum profit by buying and selling a share at most twice dry-run. Dry-run Maximum profit by buying and selling a share at most twice. Name the trap: only reciting the name of Maximum profit by buying and selling a share at most twice.

Example

# Maximum profit by buying and selling a share at most twice
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Maximum profit by buying and selling a share at most twice: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefMaximum profit by buying and selling a share at most twice — Vikram uses it for a Maximum profit by buying and selling a share at most twice dry-run in lab hour.
  • RuleMaximum profit by buying and selling a share at most twice → one Maximum profit by buying and selling a share at most twice step Vikram can write from memory.
  • RememberMaximum profit by buying and selling a share at most twice + Big-O (lab hour).
  • UseMaximum profit by buying and selling a share at most twice in lab hour (a Maximum profit by buying and selling a share at most twice dry-run).
  • TrapMaximum profit by buying and selling a share at most twice — only reciting the name of Maximum profit by buying and selling a share at most twice.
  • ExMaximum profit by buying and selling a share at most twice → a Maximum profit by buying and selling a share at most twice dry-run.

Questions

1

In one breath: what does Maximum profit by buying and selling a share at most twice do for Vikram?

2

Where does Maximum profit by buying and selling a share at most twice show up in lab hour?

3

How do you catch only reciting the name of Maximum profit by buying and selling a share at most twice?

4

Show Maximum profit by buying and selling a share at most twice in Big-O terms — three lines max.

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