When learning about 2D BIT, I have the question that 2D BIT can be easily updated 1 element and get sum, but can update the range ?
Problem:
for each query, you need to update the rectangle (x, y, u, v) each coordinate of a rectangle with upper left corner (x, y) and lower right corner being (u, v) incremented by c "at the same time".
After the update, we can find the sum query (x1,y1,x2,y2);
For example:
Sum(2,3,3,4) is 28;
Is it possible to solve this problem? If so, please show how to do it!!!
thanks for help!!!