import sys input = sys.stdin.readline def init(start, end, index): if start == end: tree[index] = li[start] return tree[index] mid = (start + end) // 2 tree[index] = init(start, mid, index * 2) + init(mid + 1, end, index * 2 + 1) return tree[index] def interval_sum(start, end, index, left, right): if left > end or right < start: return 0 if left = end: return tree[index] mid = (start + end) // 2..