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Title
Description (markdown)
Difficulty
easy
medium
hard
Prelude version
Time cap (sec)
Starter code
func solve() { // your code }
Harness template
A — pure function
B — inout / in-place
C — class with op sequence
Default comparator
exact
set_equal
float_tolerance
tree_shape
validator
Harness spec (JSON)
{ "template": "A", "func": "solve", "args": [], "ret": { "swift_type": "Void", "semantic": "plain" } }
Default comparator args (JSON)
{}
Example test cases (visible) — JSON array of {inputs, expected}
[]
Hidden test cases — JSON array
[]
Reference solution (admin-only)
// reference Swift solution
Active (shown to players)
Reveal first failing case (rare; default off)
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