few days ago . my friend go to have an interview.he saw this meaningful algorithm . like leetcode spiral matrix.

here is my code,in my code,i predefine the matrix is 17*17 ðŸ™‚

```
int arr[17][17];
int m=17;
int n=17;
int i = 0;
int j = 0;
int count = 1;
int the_max = 0;
int max = m*n;
// initial to 0
for (int j = 0; j < n; j++)
{
for (int i = 0; i < m; i++)
{
arr[i][j] = 0;
}
}
// construct the matrix
for (; count <= max; )
{
i = the_max;
j = the_max;
// top row
for(;i<m-the_max-1;i++){
arr[i][j] = count++;
}
// right column
for(;j<n-the_max-1;j++){
arr[i][j] = count++;
}
// bottom row
for(;i>the_max;i--){
arr[i][j] = count++;
}
// left column
for(;j>the_max;j--){
arr[i][j] = count++;
}
the_max++;
}
```

something detail must to be caucion .the odd parameter should have a special process.

since the last row,the first 12 rows cannot print the last row.for example 17*17 , 656,666 wil not show instead of 0.

so i hope i will fix it will the code in the future ðŸ™‚

i think this problem also have other more powerful solutions!