Balance the Seesaw

Kids line up; the teacher seats them alternately — front of the line to the LEFT side, back of the line to the RIGHT side, repeat. ⚖️

You get the kids' weights (front first). Left takes the front, right takes the back, alternating (left first; if one kid remains, left gets them). Print left <total> right <total>.

Example:

Input: weights = [30, 20, 25, 35] Output: left 50 right 60

Left takes the front 30, right takes the back 35, left takes the new front 20, right takes the new back 25 — left totals 30 + 20 = 50, right totals 35 + 25 = 60.