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Code Matrix

# Spiral traversal of matrix in c++

C++ program for Spiral traversal of matrix. Here problem description and explanation.

``````// Include header file
#include <iostream>
#include <vector>
using namespace std;
// C++ program
// Spiral form of 2d array
class SpiralView
{
public: void spiral(vector < vector < int >> data,
int startRow, int startCol,
int endRow, int endCol, int element)
{
// Left to right
for (int i = startCol;
i <= endCol && element > 0; ++i)
{
element--;
cout << "  " << data[startRow][i];
}
// Top to down
for (int i = startRow + 1;
i <= endRow && element > 0; ++i)
{
element--;
cout << "  " << data[i][endCol];
}
// Bottom right to bottom-left
for (int i = endCol - 1;
i >= startCol && element > 0; --i)
{
element--;
cout << "  " << data[endRow][i];
}
// Bottom left to top
for (int i = endRow - 1;
i > startRow && element > 0; --i)
{
element--;
cout << "  " << data[i][startRow];
}
if (startRow + 1 <= endRow - 1 && element > 0)
{
// Recursive call
this->spiral(data, startRow + 1,
startCol + 1, endRow - 1,
endCol - 1, element);
}
}
};
int main()
{
// 2d matrix
vector < vector < int >> matrix
{
{1 ,  2 ,  3 ,  4 ,  5 ,  6} ,
{22 , 23 , 24 , 25 , 26 , 7} ,
{21 , 36 , 37 , 38 , 27 , 8} ,
{20 , 35 , 42 , 39 , 28 , 9} ,
{19 , 34 , 41 , 40 , 29 , 10} ,
{18 , 33 , 32 , 31 , 30 , 11} ,
{17 , 16 , 15 , 14 , 13 , 12}
};
int row = matrix.size();
int col = matrix[0].size();
// Get the number of element
int element = row *col;
task->spiral(matrix, 0, 0, row - 1, col - 1, element);
return 0;
}``````

Output

``  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42``

## Comment

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