find a balance point in an array
array不是sorted的，裏面可能有負數。
解法也是從兩邊往中間搞，用兩個數組left和right存原數組從左向右和從右向左的元素和。然後按index來比較left和right兩個數組裏的元素，有相等的就是balance point.
find a balance point in an array
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