看代码：
class Solution { public: bool isRectangleOverlap(vector<int>& rec1, vector<int>& rec2) { int x1 = max(rec1[0], rec2[0]), y1 = max(rec1[1], rec2[1]); int x2 = min(rec1[2], rec2[2]), y2 = min(rec1[3], rec2[3]); if(x1 >= x2 || y1 >= y2) return false; return true; } };
原文：https://www.cnblogs.com/rookie-acmer/p/15208261.html