Solved p250 with 161pt. My idea is to simulate the move of robot and then cut the minimum board.
p500 is still too hard for me, it takes a thorough analysis of the game. Coding itself is trivial. I am not good at that.
p1000 is a DP but with N up to 10^9, you need to be good at compressing states.
The result is not too bad for me as many people failed their solution. I am now only 50pt away from getting yellow.
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