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This approach involves calculating the area of each rectangle separately, then finding the overlapping area, and subtracting it from the total. First, calculate the area of each rectangle by using the formula width multiplied by height. To find the overlap, determine the maximum of the bottom-left x and y coordinates, and the minimum of the top-right x and y coordinates. If the rectangles do intersect, subtract the overlap area from the sum of the rectangle areas to get the total covered area.
The time complexity is O(1) since it involves basic arithmetic operations, and the space complexity is also O(1) as no additional space is needed beyond a few variables.
1#include <stdio.h>
2
3int computeArea(int ax1, int ay1, int ax2, int ay2, int bx1, int by1, int bx2, int by2) {
4 int area1 = (ax2 - ax1) * (ay2 - ay1);
5 int area2 = (bx2 - bx1) * (by2 - by1);
6 int overlapWidth = ((ax2 < bx2) ? ax2 : bx2) - ((ax1 > bx1) ? ax1 : bx1);
7 int overlapHeight = ((ay2 < by2) ? ay2 : by2) - ((ay1 > by1) ? ay1 : by1);
8 int overlapArea = 0;
9 if (overlapWidth > 0 && overlapHeight > 0) {
10 overlapArea = overlapWidth * overlapHeight;
11 }
12 return area1 + area2 - overlapArea;
13}
14
15int main() {
16 printf("%d\n", computeArea(-3, 0, 3, 4, 0, -1, 9, 2));
17 printf("%d\n", computeArea(-2, -2, 2, 2, -2, -2, 2, 2));
18 return 0;
19}This program first computes the rectangles' areas using their width and height. It then calculates the overlap width and height based on intersecting limits of x and y coordinates. If these intersections are valid (width and height are positive), it then computes the overlap area and subtracts it from the total area of both rectangles. Finally, it outputs the total area covered by the rectangles.
By using the coordinate sweep method, we can iterate through all points in a uniform grid covering both rectangles. This technique conceptualizes sweeping lines across the plane, adding and subtracting areas as intersections are counted. Use sorting and a plane-sweep technique to determine overlapping intervals more effectively.
The time complexity remains O(1) since it involves constant time computation, while the space complexity is also O(1) because it uses a constant number of variables.
1
This C variant checks if two rectangles can overlap by verifying bounding constraints. The rectangles' areas are computed, and the overlapping area is considered zero if there is no overlap. Otherwise, overlapping dimensions are calculated, and their areas are subtracted accordingly.