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  1. #include <iostream>
  2. using namespace std;
  3. const int w = 5, h = 5;
  4. int input[w][h] =  {{1,0,0,0,1},
  5. 					{1,1,0,1,1},
  6. 					{0,1,0,0,1},
  7. 					{1,1,1,1,0},
  8. 					{0,0,0,1,0}};
  9. int component[w*h];
  10. void doUnion(int a, int b)
  11. {
  12.   // get the root component of a and b, and set the one's parent to the other
  13.   while (component[a] != a)
  14.     a = component[a];
  15.   while (component[b] != b)
  16.     b = component[b];
  17.   component[b] = a;
  18. }
  19.  
  20. void unionCoords(int x, int y, int x2, int y2)
  21. {
  22.   if (y2 < h && x2 < w && input[x][y] && input[x2][y2])
  23.     doUnion(x*h + y, x2*h + y2);
  24. }
  25.  
  26. int main()
  27. {
  28.   // set up input
  29.   for (int i = 0; i < w*h; i++)
  30.     component[i] = i;
  31.   for (int x = 0; x < w; x++)
  32.   for (int y = 0; y < h; y++)
  33.   {
  34.     unionCoords(x, y, x+1, y);
  35.     unionCoords(x, y, x, y+1);
  36.   }
  37.  
  38. 	for (int x = 0; x < w; x++)
  39. 	{
  40. 	  for (int y = 0; y < h; y++)
  41. 	  {
  42. 	  	 if (input[x][y] == 0)
  43. 	  	 {
  44. 	  	    cout << ' ';
  45. 	  	    continue;
  46. 	  	 }
  47. 	     int c = x*h + y;
  48. 	     while (component[c] != c) c = component[c];
  49. 	     cout << (char)('a'+c);
  50. 	  }
  51. 	  cout << "\n";
  52. 	}
  53. }
  54.  
  55.  
Success #stdin #stdout 0s 15224KB
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p   i
pp ii
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pppp 
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https://ideone.com/4Bg35n
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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