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Binary tree question -
Node has numeric data (int)
The function takes depth as argument and sum all the value
of the node of the depth.
For instance,
(0) depth 0
/ \
10 20 depth 1
/ \ / \
40 50 60 70 depth 2
so if you pass get_sum(2), you would return 220 which is
40+50+60+70 (sum of depth2)
write the function.
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