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Was ich beim Advent Of Code 2018 gelernt habe
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TIL: Summed Area Table
-3
1
3
5 7 -7
1
3
3 4 3 + 1 + 3 - 1 = 6 -5 3 3 4 -4 4 3 3 4 -3 3 3 3 -5 -1