v0.40: Create exercises. Challenge the community.

paren_repair

Your mission

Write a program that repairs a parenthesis-only string by blanking the fewest characters possible.

See it in action

./paren_repair '(()' | cat -e

Expected result

 ()$
( )$

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly one argument (argc must be 2), containing only ( and ) characters.
If the input is already balanced, print it unchanged followed by a newline.
Otherwise, replace the minimum number of parentheses with spaces so every printed line is balanced.
Print every distinct solution that uses that minimum number of replacements.
Each output line must keep the same length as the original argument.
When several solutions exist, print them by scanning replacement choices from left to right.
Return 1 when the argument count is wrong.

More examples

./paren_repair '((()))' | cat -e

Expected result

((()))$

Constraints

Expected files

paren_repair.c

Allowed functions

writeputs

paren_repair

Parsing and formats

Your mission

Write a program that repairs a parenthesis-only string by blanking the fewest characters possible.

See it in action

./paren_repair '(()' | cat -e

Expected result

 ()$
( )$

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly one argument (argc must be 2), containing only ( and ) characters.
If the input is already balanced, print it unchanged followed by a newline.
Otherwise, replace the minimum number of parentheses with spaces so every printed line is balanced.
Print every distinct solution that uses that minimum number of replacements.
Each output line must keep the same length as the original argument.
When several solutions exist, print them by scanning replacement choices from left to right.
Return 1 when the argument count is wrong.

More examples

./paren_repair '((()))' | cat -e

Expected result

((()))$

Constraints

Expected files

paren_repair.c

Allowed functions

writeputs

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01One extra opening parenthesisWaiting

02One extra closing parenthesisWaiting

03Already balancedWaiting

04All characters replacedWaiting

05Only opening parenthesesWaiting

06Only closing parenthesesWaiting

07Empty balanced inputWaiting

08Missing inputWaiting

09Too many argumentsWaiting

paren_repair

Your mission

Write a program that repairs a parenthesis-only string by blanking the fewest characters possible.

See it in action

./paren_repair '(()' | cat -e

Expected result

 ()$
( )$

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly one argument (argc must be 2), containing only ( and ) characters.
If the input is already balanced, print it unchanged followed by a newline.
Otherwise, replace the minimum number of parentheses with spaces so every printed line is balanced.
Print every distinct solution that uses that minimum number of replacements.
Each output line must keep the same length as the original argument.
When several solutions exist, print them by scanning replacement choices from left to right.
Return 1 when the argument count is wrong.

More examples

./paren_repair '((()))' | cat -e

Expected result

((()))$

Constraints

Expected files

paren_repair.c

Allowed functions

writeputs

paren_repair

Parsing and formats

Your mission

Write a program that repairs a parenthesis-only string by blanking the fewest characters possible.

See it in action

./paren_repair '(()' | cat -e

Expected result

 ()$
( )$

Your checklist

For your own tracking. Tests grade your code.

The program expects exactly one argument (argc must be 2), containing only ( and ) characters.
If the input is already balanced, print it unchanged followed by a newline.
Otherwise, replace the minimum number of parentheses with spaces so every printed line is balanced.
Print every distinct solution that uses that minimum number of replacements.
Each output line must keep the same length as the original argument.
When several solutions exist, print them by scanning replacement choices from left to right.
Return 1 when the argument count is wrong.

More examples

./paren_repair '((()))' | cat -e

Expected result

((()))$

Constraints

Expected files

paren_repair.c

Allowed functions

writeputs

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01One extra opening parenthesisWaiting

02One extra closing parenthesisWaiting

03Already balancedWaiting

04All characters replacedWaiting

05Only opening parenthesesWaiting

06Only closing parenthesesWaiting

07Empty balanced inputWaiting

08Missing inputWaiting

09Too many argumentsWaiting

v0.40: Create exercises. Challenge the community.

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