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  1. //http://w...content-available-to-author-only...s.org/archives/12916
  2.  
  3. #include <stdio.h>
  4. #define N 8
  5.  
  6. int isSafe(int x, int y, int soln[][N])
  7. {
  8. 	if(x>=0 && x<N && y>=0 && y<N && soln[x][y]==-1){
  9. 		return 1;
  10. 	}
  11. 	return 0;
  12. }
  13.  
  14. int generateMoves(int x, int y, int moveNum, int soln[][N], int xMoves[], int yMoves[])//making move number 'moveNum' from x and y.
  15. {
  16. 	if(moveNum == N*N){
  17. 		return 1;
  18. 	}
  19. 	else{
  20. 		int i, nextX, nextY;
  21. 		for(i=0; i<8; ++i){
  22. 			nextX = x + xMoves[i];
  23. 			nextY = y + yMoves[i];
  24.  
  25. 			if(isSafe(nextX, nextY, soln)){
  26. 				soln[nextX][nextY] = moveNum;
  27. 				if( generateMoves(nextX, nextY, moveNum+1, soln, xMoves, yMoves) ){
  28. 					return 1;
  29. 				}
  30. 				else{
  31. 					soln[nextX][nextY] = -1;
  32. 				}
  33. 			}
  34. 		}
  35. 		return 0;
  36. 	}
  37. }
  38.  
  39. void printSoln(int soln[][N])
  40. {
  41. 	int i, j;
  42. 	for(i=0; i<N; ++i){
  43. 		for(j=0; j<N; ++j){
  44. 			printf("%2d ", soln[i][j]);
  45. 		}
  46. 		printf("\n");
  47. 	}
  48. }	
  49.  
  50. void moveKnight()
  51. {
  52. 	int soln[N][N];
  53. 	int i, j;
  54. 	for(i=0; i<N; ++i){
  55. 		for(j=0; j<N; ++j){	
  56. 			soln[i][j] = -1;
  57. 		}
  58. 	}
  59.  
  60. 	int xMoves[] = {2, 2, 1, 1, -1, -1, -2, -2};
  61. 	int yMoves[] = {1, -1, -2, 2, -2, 2, -1, 1};
  62.  
  63. 	soln[0][0] = 0; //making the first move i.e. putting the knight at (0, 0)
  64. 	if( generateMoves(0, 0, 1, soln, xMoves, yMoves) ){
  65. 		printSoln(soln);
  66. 	}
  67. 	else{
  68. 		printf("\nNOT POSSIBLE\n");
  69. 	}
  70. }
  71.  
  72. int main()
  73. {
  74. 	moveKnight();
  75. 	return 0;
  76. }
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https://ideone.com/RP068
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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