Fading Coder

Statistical Operations on Intervals Problem Description Given a sequence of up to 1e5 elements, support three operations on intervals [l, r]: Add a constant value to all elements in the interval Calculate the average of elements in the interval Calculate the variance of elements in the itnerval Vari...

Dynamic node creation is used when the value range is large (e.g., 1e9) to conserve memory and avoid waste. Nodes are allocated only when needed, and queries return immediately upon reaching a null node. void update(int& node, int left, int right, int pos, int delta) { if (!node) node = ++node_c...