/** * A rectangle is represented as a list [x1, y1, x2, y2], where (x1, y1) are * the coordinates of its bottom-left corner, and (x2, y2) are the coordinates * of its top-right corner. * * Two rectangles overlap if the area of their intersection is positive. To be * clear, two rectangles that only touch at the corner or edges do not overlap. * * Given two (axis-aligned) rectangles, return whether they overlap. * * Example 1: * Input: rec1 = [0,0,2,2], rec2 = [1,1,3,3] * Output: true * * Example 2: * Input: rec1 = [0,0,1,1], rec2 = [1,0,2,1] * Output: false * * Notes: * Both rectangles rec1 and rec2 are lists of 4 integers. * All coordinates in rectangles will be between -10^9 and 10^9. */ public class RectangleOverlap863 { public boolean isRectangleOverlap(int[] rec1, int[] rec2) { return isIntervalOverlap(rec1[0], rec1[2], rec2[0], rec2[2]) && isIntervalOverlap(rec1[1], rec1[3], rec2[1], rec2[3]); } private boolean isIntervalOverlap(int a1, int a2, int b1, int b2) { return !(a2 = rec2[2] || // right rec1[1] >= rec2[3]); // top } }