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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 6 11
17 -12
1 7 16
18
-8
6 17
30
29 -5 12 26 34 32 Sum = 30 + -8 + 5 - -3