class Solution

 {

 public:

     bool isRectangleOverlap(vector<int>& rec1, vector<int>& rec2)

     {

         return rec1[]<rec2[]&&rec2[]<rec1[]&&rec1[]<rec2[]&&rec2[]<rec1[];

     }

 };

r1left      r2left     r1right      r2right

一个方向上的判定条件：left1<right2&&left2<right1

用两个方向上的判定即可

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