11. Sum all elements
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Input
Goal output
Your output
❌
[4,4]
8
0
❌
[1,2,3]
6
0
❌
[7,7,7,7]
28
0
❌
[1,2,3,4,5]
15
0
❌
[5,4,3,2,1]
15
0
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