diff --git a/Operations on Datastructures/matrix_layer_rotation.cpp b/Operations on Datastructures/matrix_layer_rotation.cpp new file mode 100644 index 000000000..1056b2523 --- /dev/null +++ b/Operations on Datastructures/matrix_layer_rotation.cpp @@ -0,0 +1,52 @@ +#include +#include +using namespace std; +template inline void do_rotate(Type* rotated_matrix, const pair& position, const unsigned &row, const unsigned &columm, const uint8_t inside_row, const uint8_t inside_columm, const uint8_t rotation_position, const Type* const element) { + int*rotated_matrix_walker = (rotated_matrix + position.first * columm + (position.second)); + int offset = 1, element_index = -1; + while (true) + { + if (++element_index == rotation_position) { + *rotated_matrix_walker = *element; + return; + } + rotated_matrix_walker += offset; + if (rotated_matrix + ((position.first * columm) + position.second + inside_columm - 1) == rotated_matrix_walker) offset = columm; + else if (rotated_matrix + ((position.first * columm) + position.second + ((inside_row - 1) * columm) + inside_columm - 1) == rotated_matrix_walker) offset = -1; + else if (rotated_matrix + ((position.first * columm) + position.second + ((inside_row - 1) * columm)) == rotated_matrix_walker) offset = -1 * columm; + } +} +template Type* matrix_rotation(Type * const matrix, const unsigned row, const unsigned column, const unsigned rotation) { + pair position = make_pair(0, 0); + Type *rotated_matrix = new Type[row * column]; + int offset = 1; + int *matrix_walker = matrix; + uint8_t inside_row = row, inside_column = column; + int32_t array_lenght(0), element_index(0); + while (inside_row > 0 && inside_column > 0) + { + array_lenght = (2 * inside_column + ((inside_row - 2) * 2)); + do + { + do_rotate(rotated_matrix, position, row, column, inside_row, inside_column, (rotation + element_index) % array_lenght, matrix_walker); + matrix_walker += offset; + element_index++; + if (matrix + ((position.first * column) + position.second + inside_column - 1) == matrix_walker) offset = column; + else if (matrix + ((position.first * column) + position.second + ((inside_row - 1) * column) + inside_column - 1) == matrix_walker) offset = -1; + else if (matrix + ((position.first * column) + position.second + ((inside_row - 1) * column)) == matrix_walker) offset = -1 * column; + } while ((matrix + (position.first * column + position.second)) != matrix_walker); + position.first++; + position.second++; + inside_row -= 2; + inside_column -= 2; + offset = 1; + matrix_walker = matrix + (position.first * column) + (position.second); + } + return rotated_matrix; +} +int main() +{ + int *matrix = new int[16]{7,20,31,90,9,10,40,8,50,2,70,10,10,20,25,49}; + int*rotated_matrix = matrix_rotation(matrix,4,4,1); + return 0; +}