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This was a HUGE task. For me the second hardest in CodinGame so far, after the Mars Lander puzzle. It really tweaked my imagination and got me thinking. I tried several solutions but non of them came close to 100% result, especially with the “You may have to anticipate the arrival of some rocks if you want Indy to survive…” idea in the problem statement. In the end I decided to implement DFS as much optimized as possible, run it every turn when I see a collision danger for Indy and it worked quite well. Definitely one of my favorite puzzles.