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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. void print_spiral (int ** matrix, int size);
  5.  
  6. int main()
  7. {
  8. 	int ** matrix = new int * [4];
  9. 	for (int i=0; i<4; i++) matrix[i] = new int[4];
  10.  
  11. 	// {  7,  8,  9, 10 },
  12. 	// {  6,  1,  2, 11 },
  13. 	// {  5,  4,  3, 12 },
  14. 	// { 16, 15, 14, 13 }
  15.  
  16. 	matrix[0][0] = 7;  matrix[0][1] = 8;  matrix[0][2] = 9;  matrix[0][3] = 10;
  17. 	matrix[1][0] = 6;  matrix[1][1] = 1;  matrix[1][2] = 2;  matrix[1][3] = 11;
  18. 	matrix[2][0] = 5;  matrix[2][1] = 4;  matrix[2][2] = 3;  matrix[2][3] = 12;
  19. 	matrix[3][0] = 16; matrix[3][1] = 15; matrix[3][2] = 14; matrix[3][3] = 13;
  20.  
  21. 	print_spiral(matrix, 4);
  22.  
  23. 	return 0;
  24. }
  25.  
  26. void print_spiral (int ** matrix, int size)
  27. {
  28.     int x = 0; // current position; x
  29.     int y = 0; // current position; y
  30.     int d = 0; // current direction; 0=RIGHT, 1=DOWN, 2=LEFT, 3=UP
  31.     int c = 0; // counter
  32.     int s = 1; // chain size
  33.  
  34.     // starting point
  35.     x = ((int)floor(size/2.0))-1;
  36.     y = ((int)floor(size/2.0))-1;
  37.  
  38.     for (int k=1; k<=(size-1); k++)
  39.     {
  40.         for (int j=0; j<(k<(size-1)?2:3); j++)
  41.         {
  42.             for (int i=0; i<s; i++)
  43.             {
  44.                 std::cout << matrix[x][y] << " ";
  45.                 c++;
  46.  
  47.                 switch (d)
  48.                 {
  49.                     case 0: y = y + 1; break;
  50.                     case 1: x = x + 1; break;
  51.                     case 2: y = y - 1; break;
  52.                     case 3: x = x - 1; break;
  53.                 }
  54.             }
  55.             d = (d+1)%4;
  56.         }
  57.         s = s + 1;
  58.     }
  59. }
  60.  
Success #stdin #stdout 0s 3412KB
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https://ideone.com/0bWDJ7
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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