836.swift

//
//  RectangleOverlap.swift
//  LeetCodeTests
//
//  Created by Lex on 2018/7/8.
//  Copyright © 2018 Lex Tang. All rights reserved.
//

//  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.

import XCTest

func isRectangleOverlap(_ rec1: [Int], _ rec2: [Int]) -> Bool {
    guard rec1.count == 4 && rec2.count == 4 else { return false }
    return min(rec1[2], rec2[2]) - max(rec1[0], rec2[0]) > 0
        && min(rec1[3], rec2[3]) - max(rec1[1], rec2[1]) > 0
}

class RectangleOverlapTest: XCTestCase {

    func testReactangleOverlap() {
        XCTAssertTrue(isRectangleOverlap([0,0,2,2], [1,1,3,3]))
        XCTAssertFalse(isRectangleOverlap([0,0,1,1], [1,0,2,1]))
    }

}