A3-CS109-2023Spring CS109-23Spring Assignment 3 Contributor List Problem 1: Sirui LI Problem 2: Yitong WANG Problem 3: Yitong WANG Problem 4: Yuwei XIAO Problem 1. Mine Sweeper(Easy, 20 points) Problem 2. Safe Areas in RA2 Battlefield(Medium, 20 points) Problem 3. Hatsune Miku's Puzzle(Hard, 30 points) Problem 4. Trivial Tetris Game(Medium, 30 points)