001-algorithm-print matrix on the clockwise

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4 5 6   ---> 1 2 3 6 9 8 7 4 5

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void print_matrix(int a[], int m, int n){//matrix a with size m nstd::vector<int> x;int point1 = 0;int point2 = n - 1;int point3 = m*n - 1;int point4 = m*n - n;while (point1<=point2 && point2<=point3 && point3>=point4 && point4>=point1){for (int i = point1; i < point2; i++){x.push_back(a[i]);}for (int i = point2; i < point3; i += n){x.push_back(a[i]);}for (int i = point3; i > point4; i--){x.push_back(a[i]);}for (int i = point4; i > point1; i -= n){x.push_back(a[i]);}if (point1 == point2 && point3 == point4 && point1==point3){x.push_back(a[point1]);}point1 += (n + 1);point2 += (n - 1);point3 -= (n + 1);point4 -= (n - 1);}//whilefor (auto i : x){std::cout << i << " ";}}