Practice · 1 of 3

Timed (3 min): parallel-filter count

CHALLENGE

Difficulty: intermediate+25 XP

Set a real timer for **3 minutes**. Implement countBelow: count the values vals[i] **strictly below** limit where the parallel flags[i] equals "on". After submitting, log: target vs actual, and which phase ate the surplus.

Press Submit to check your solution.

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