// 顺时针打印矩阵

#include <iostream>

void PrintMatrixInCircle(int arr[][10], int columns, int rows, int start)

{

int endX = columns - start - 1;

int endY = rows - start - 1;

// 从左至右

for (int i = start; i <= endX; ++i)

{

std::cout << arr[start][i];

}

// 从上至下

if (start < endY)

{

for (int i = start + 1; i <= endY; ++i)

{

std::cout << arr[i][endX];

}

}

// 从右至左

if (start < endX && start < endY)

{

for (int i = endX - 1; i >= start; --i)

{

std::cout << arr[endY][i];

}

}

// 从下至上

if (start < endX && start < endY - 1)

{

for (int i = endY - 1; i >= start + 1; --i)

{

std::cout << arr[i][start];

}

}

}

void PrintMatrix(int arr[][10], int columns, int rows)

{

if (!arr || columns <= 0 || rows <= 0)

return;

int start = 0;

while (columns > start * 2 && rows > start * 2)

{

PrintMatrixInCircle(arr, columns, rows, start);

++start;

}

}

int main()

{

int arr[10][10] = { 0 };

int columns = 0, rows = 0;

std::cin >> rows >> columns;

for (int i = 0; i < rows; ++i)

{

for (int j = 0; j < columns; ++j)

{

std::cin >> arr[i][j];

}

}

PrintMatrix(arr, columns, rows);

return 0;

}