Source code for submission s1271

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grasshop.c

  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int R,C, Lr, Lc, Gr, Gc;
  5.  
  6. int get_dist(int a, int b, int x, int y)
  7. {
  8. 	return fabs(x-a) + fabs(y-b);
  9. }
  10.  
  11. int main()
  12. {
  13. 	while(scanf("%d %d %d %d %d %d", &R,&C,&Gr,&Gc,&Lr,&Lc) == 6)
  14. 	{
  15. 		int d = get_dist(Gr, Gc, Lr, Lc);
  16. 		int x = fabs(Gr-Lr);
  17. 		int y = fabs(Gc-Lc);
  18. 		int result = 0;
  19. 		if (d == 0) {
  20. 			printf("0\n");
  21. 		}
  22. 		else if (R == 1 || C == 1) {
  23. 			printf("impossible\n");
  24. 		} else if (R == 2 || C == 2) {
  25. 			int t = (x > y) ? x : y;
  26. 			if (Gc == Lc || Gr == Lr) {
  27. 				if (t % 4 == 0) {
  28. 					printf("%d\n", t/2);
  29. 				} else printf("impossible\n");
  30. 			} else {
  31. 				if ((t+2) % 4 == 0) {
  32. 					printf("%d\n", t/2);
  33. 				} else printf("impossible\n");
  34. 			}
  35. 		} else if (R == 3 && C == 3) {
  36. 			if (Lr == 2 && Lc == 2) printf("impossible\n");
  37. 			else {
  38. 				switch(d) {
  39. 					case 1:
  40. 						printf("3\n");
  41. 						break;
  42. 					case 3:
  43. 						printf("1\n");
  44. 						break;
  45. 					case 4:
  46. 						printf("4\n");
  47. 						break;
  48. 					case 5:
  49. 						printf("3\n");
  50. 						break;
  51. 				}
  52. 			}
  53. 		} else {
  54. 			while (x > 2 || y > 2 ) {
  55. 				if (x > y) {
  56. 					x -= 2;
  57. 					y--;
  58. 					if (y<0) y = 2;
  59. 				} else {
  60. 					y -= 2;
  61. 					x--;
  62. 					if (x<0) x = 2;
  63. 				}
  64. 				result++;
  65. 			}
  66.  
  67. 			switch(x+y) {
  68. 				case 1:
  69. 					printf("%d\n", result+3);
  70. 					break;
  71. 				case 2:
  72. 					printf("%d\n", result+2);
  73. 					break;
  74. 				case 3:
  75. 					printf("%d\n", result+1);
  76. 					break;
  77. 				case 4:
  78. 					printf("%d\n", result+4);
  79. 					break;
  80. 			}
  81. 		}
  82. 	}
  83. 	return 0;
  84. }
  85.  

Diff to submission s1090

grasshop.c

--- c4.s1090.cteam074.grasshop.c.0.grasshop.c
+++ c4.s1271.cteam074.grasshop.c.0.grasshop.c
@@ -24,10 +24,10 @@
                 } else if (R == 2 || C == 2) {
                         int t = (x > y) ? x : y;
-                        if (Gr == Lr || Gc == Gc) {
-                                if ((t+2) % 4 == 0) {
+                        if (Gc == Lc || Gr == Lr) {
+                                if (t % 4 == 0) {
                                         printf("%d\n", t/2);
                                 } else printf("impossible\n");
                         } else {
-                                if (t % 4 == 0) {
+                                if ((t+2) % 4 == 0) {
                                         printf("%d\n", t/2);
                                 } else printf("impossible\n");