Fourteen problems from Codeforces and AtCoder, the two biggest competitive programming judges. They are submitted on those sites, and they follow this week's order: stacks first (a backspace key, cubes that cancel, brackets moved to the ends, letters that vanish in threes, balls that disappear in runs), then queues and deques (a restaurant line, cards taken from both ends, rows built at both ends, a string that keeps being reversed, a queue of huge blocks), and simulations last (an evacuation, two card games).
The statements are in English (and Japanese, on AtCoder). Read the limits
carefully: several of these answers need long long.