我自己的写得很丑很慢，开平方计算太慢了，没什么好说的，看看人家的。

我的解法

class Solution {
public:
    vector<int> constructRectangle(int area) {
        vector<int> output;
        int w = sqrt(area) / 1;
        int a = 0, b = 0;
        for (int i = w; i <= area; i ++)
            if (area % i == 0){
                b = area / i;
                a = i >= b ? i : b;
                output.push_back(a);
                output.push_back(area / a);
                return output;
            }
    }
};

人家的解法

平方比开方运算快得多= =

class Solution {
public:
    vector<int> constructRectangle(int area) {
        if (area <= 0) return vector<int> {};
        vector<int> res;
        int w = area;
        for (int i = 1; i * i <= area; ++i) {
            if (area % i == 0) w = i;
        }
        return vector<int> {area / w, w};
    }
};