chaios

Your mission

Copy a string, keeping only the first character of every run of repeats.

today's brief

January 2018. A researcher posts a link, and every iPhone that previews it freezes and resprings, sometimes dragging the whole phone down with it. The page was one line of text repeated far past anything a preview was built to lay out. People shared it as a prank for a week. Squeeze the runs down before the renderer sees them.

See it in action

squeeze(dst, "haaaaaaaaa")

Expected result

[ha]

Your checklist

For your own tracking. Tests grade your code.

s is a null-terminated string and dst has room for the result.
Copy s into dst in order, but where the same character repeats several times in a row, keep only the first of them.
A character that comes back later, after something else, is kept again.
Null-terminate dst.

More examples

squeeze(dst, "aaabbbccc")

Expected result

[abc]

squeeze(dst, "abc")

Expected result

[abc]

Constraints

Expected files

runs.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

chaios

Your mission

Copy a string, keeping only the first character of every run of repeats.

today's brief

See it in action

squeeze(dst, "haaaaaaaaa")

Expected result

[ha]

Your checklist

For your own tracking. Tests grade your code.

s is a null-terminated string and dst has room for the result.
Copy s into dst in order, but where the same character repeats several times in a row, keep only the first of them.
A character that comes back later, after something else, is kept again.
Null-terminate dst.

More examples

squeeze(dst, "aaabbbccc")

Expected result

[abc]

squeeze(dst, "abc")

Expected result

[abc]

Constraints

Expected files

runs.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions