Source code for submission s654

grasshop.cpp

  1. #include <stdio.h>
  2. #include <queue>
  3. #include <vector>
  4. using namespace std;
  5. bool done=false;
  6. bool inboard(int i, int j,int x,int y){
  7. if(i>0 && i<=x && j>0 && j<=y)
  8. return true;
  9. else 
  10. return false;
  11. }
  12. class uzol{
  13. public:
  14.  int step;
  15.  int x,y;
  16. };
  17.  
  18. int step(int x, int y,int step,queue<uzol> & fronta,vector<vector<int> > & board){
  19. 	if(board[x][y]==-2){
  20. 		printf("%d\n",step+1);
  21. done=true;
  22. 		return 0;		//koniec
  23. 	}else if(board[x][y]==-1){
  24. 		board[x][y]=step+1;
  25. 	} else{
  26. 		if(board[x][y]>step+1)
  27. 			board[x][y]=step+1;
  28. 	}
  29. 	uzol r;
  30. 	r.x=x;
  31. 	r.y=y;	
  32. 	r.step=step+1;
  33. 	fronta.push(r);
  34. return 1;
  35. }
  36.  
  37. int main(){
  38. int a,b,c,d,e,f;
  39. vector<vector<int> > board;
  40. board.resize(101);
  41. for(int i=0;i<101;i++)
  42. board[i].resize(101);
  43.  
  44.  
  45. 	while(scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f)==6){
  46. 		done=false;
  47. 		queue<uzol> fronta;
  48. 		for(int i=0;i<=a;i++){
  49. 			for(int j=0;j<=b;j++){
  50. 				board[a][b]=-1;
  51. 			}
  52. 		}	
  53. 		board[e][f]=-2;
  54. 		board[c][d]=0;
  55. 		uzol f;
  56. 		f.step=0;
  57. 		f.x=c;
  58. 		f.y=d;	
  59. 		fronta.push(f);
  60. 		while(fronta.size()>0){
  61. 			uzol node=fronta.front();
  62. 			fronta.pop();
  63. 			if(inboard(node.x+2, node.y+1,a,b)){
  64. 				if(step(node.x+2, node.y+1,node.step,fronta,board)==0)break;
  65. 			}
  66. 			if(inboard(node.x+2, node.y-1,a,b)){
  67. 				if(step(node.x+2, node.y-1,node.step,fronta,board)==0)break;
  68. 			}
  69. 			if(inboard(node.x+1, node.y+2,a,b)){
  70. 				if(step(node.x+1, node.y+2,node.step,fronta,board)==0)break;
  71. 			}
  72. 			if(inboard(node.x+1, node.y-2,a,b)){
  73. 				if(step(node.x+1, node.y-2,node.step,fronta,board)==0)break;
  74. 			}
  75. 			if(inboard(node.x-2, node.y+1,a,b)){
  76. 				if(step(node.x-2, node.y+1,node.step,fronta,board)==0)break;
  77. 			}
  78. 			if(inboard(node.x-2, node.y-1,a,b)){
  79. 				if(step(node.x-2, node.y-1,node.step,fronta,board)==0)break;
  80. 			}
  81. 			if(inboard(node.x-1, node.y-2,a,b)){
  82. 				if(step(node.x-1, node.y-2,node.step,fronta,board)==0)break;
  83. 			}
  84. 			if(inboard(node.x-1, node.y+2,a,b)){
  85. 				if(step(node.x-1, node.y+2,node.step,fronta,board)==0)break;
  86. 			}
  87.  
  88.  
  89. 		}
  90. if(done==false)
  91. 		printf("impossible\n");	
  92.  
  93. 	}	
  94.  
  95. return 0;
  96. }
  97.