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DSA · Theory

COUNT OF ZEROES

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Theory

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COUNT OF ZEROES

COUNT OF ZEROES sits in lab hour. Vikram’s job is COUNT OF ZEROES on Vikram's board. Write that first.

COUNT OF ZEROES on the board: one COUNT OF ZEROES step Vikram can write from memory. Then say what COUNT OF ZEROES on Vikram's board looks like after.

Skip COUNT OF ZEROES and copy-pasting COUNT OF ZEROES without a dry-run shows up in lab hour.

Vikram ships COUNT OF ZEROES in lab hour. That is the use case worth saying.

If COUNT OF ZEROES on Vikram's board breaks under COUNT OF ZEROES, check copy-pasting COUNT OF ZEROES without a dry-run first.

Place COUNT OF ZEROES next to nearby DSA work — one COUNT OF ZEROES step Vikram can write from memory is the link.

Viva for COUNT OF ZEROES: what it is → one COUNT OF ZEROES step Vikram can write from memory → the mistake (copy-pasting COUNT OF ZEROES without a dry-run).

Exam tip

For COUNT OF ZEROES: definition + lab hour + one failure.

Example

# COUNT OF ZEROES
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)

COUNT OF ZEROES: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefCOUNT OF ZEROES — Vikram uses it for COUNT OF ZEROES on Vikram's board in lab hour.
  • RuleCOUNT OF ZEROES → one COUNT OF ZEROES step Vikram can write from memory.
  • RememberCOUNT OF ZEROES + a dry-run table (lab hour).
  • UseCOUNT OF ZEROES in lab hour (COUNT OF ZEROES on Vikram's board).
  • TrapCOUNT OF ZEROES — copy-pasting COUNT OF ZEROES without a dry-run.
  • ExCOUNT OF ZEROES → COUNT OF ZEROES on Vikram's board.

Questions

1

In one breath: what does COUNT OF ZEROES do for Vikram?

2

Name one DSA screen/job that needs COUNT OF ZEROES.

3

What trap does Vikram hit with COUNT OF ZEROES?

4

Show COUNT OF ZEROES in a dry-run table terms — three lines max.

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