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- /*
- * clockwise rotate
- * first reverse up to down, then swap the symmetry
- * 1 2 3 7 8 9 7 4 1
- * 4 5 6 => 4 5 6 => 8 5 2
- * 7 8 9 1 2 3 9 6 3
- */
- void rotate(vector<vector<int> > &matrix) {
- reverse(matrix.begin(), matrix.end());
- for (int i = 0; i < matrix.size(); ++i) {
- for (int j = i + 1; j < matrix[i].size(); ++j)
- swap(matrix[i][j], matrix[j][i]);
- }
- }
- /*
- * anticlockwise rotate
- * first reverse left to right, then swap the symmetry
- * 1 2 3 3 2 1 3 6 9
- * 4 5 6 => 6 5 4 => 2 5 8
- * 7 8 9 9 8 7 1 4 7
- */
- void anti_rotate(vector<vector<int> > &matrix) {
- for (auto vi : matrix) reverse(vi.begin(), vi.end());
- for (int i = 0; i < matrix.size(); ++i) {
- for (int j = i + 1; j < matrix[i].size(); ++j)
- swap(matrix[i][j], matrix[j][i]);
- }
- }
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