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  1. #include<stdio.h>
  2.  
  3. // test
  4.  
  5. int main (void)
  6. {
  7.     int g[5][5] =
  8.     {
  9.       { 1,0,0,0,0 },
  10.       { 0,0,1,0,0 },
  11.       { 0,1,1,1,1 },
  12.       { 1,0,1,0,0 },
  13.       { 0,0,0,1,0 }
  14.     };
  15.  
  16.     printf("\n 4-way solution = %d \n", mmd4(5,5,g, 2,2));
  17.     printf("\n 8-way solution = %d \n", mmd8(5,5,g, 2,2));
  18.  
  19.     return 0;
  20. }
  21.  
  22. // 8-way Solution
  23.  
  24. int mmd8(int h, int w, int g[h][w], int x, int y)
  25. {
  26.     putchar('#');
  27.     return max8(mmd8_up   (h,w,g,x-1,y  ,1),
  28.                 mmd8_down (h,w,g,x+1,y  ,1),
  29.                 mmd8_left (h,w,g,x  ,y-1,1),
  30.                 mmd8_right(h,w,g,x  ,y+1,1),
  31.  
  32.                 mmd8_uleft (h,w,g,x-1,y-1,1),
  33.                 mmd8_uright(h,w,g,x-1,y+1,1),
  34.                 mmd8_dleft (h,w,g,x+1,y-1,1),
  35.                 mmd8_dright(h,w,g,x+1,y+1,1));
  36. }
  37.  
  38. int mmd8_up(int h, int w, int g[h][w], int x, int y, int steps)
  39. {
  40.     if (base_case(h,w,x,y)) return 0;
  41.     putchar('U');
  42.     return max4(g[x][y]?steps:0,
  43.            mmd8_up    (h,w,g,x-1,y  ,steps+1),
  44.            mmd8_uleft (h,w,g,x-1,y-1,steps+1),
  45.            mmd8_uright(h,w,g,x-1,y+1,steps+1));
  46. }
  47.  
  48. int mmd8_down(int h, int w, int g[h][w], int x, int y, int steps)
  49. {
  50.     if (base_case(h,w,x,y)) return 0;
  51.     putchar('D');
  52.     return max4(g[x][y]?steps:0,
  53.            mmd8_down  (h,w,g,x+1,y  ,steps+1),
  54.            mmd8_dleft (h,w,g,x+1,y-1,steps+1),
  55.            mmd8_dright(h,w,g,x+1,y+1,steps+1));
  56. }
  57.  
  58. int mmd8_left(int h, int w, int g[h][w], int x, int y, int steps)
  59. {
  60.     if (base_case(h,w,x,y)) return 0;
  61.     putchar('L');
  62.     return max2(g[x][y]?steps:0,
  63.            mmd8_left (h,w,g,x  ,y-1,steps+1),
  64.            mmd8_uleft(h,w,g,x-1,y-1,steps+1),
  65.            mmd8_dleft(h,w,g,x+1,y-1,steps+1));
  66. }
  67.  
  68. int mmd8_right(int h, int w, int g[h][w], int x, int y, int steps)
  69. {
  70.     if (base_case(h,w,x,y)) return 0;
  71.     putchar('R');
  72.     return max2(g[x][y]?steps:0,
  73.            mmd8_right (h,w,g,x  ,y+1,steps+1),
  74.            mmd8_uright(h,w,g,x-1,y+1,steps+1),
  75.            mmd8_dright(h,w,g,x+1,y+1,steps+1));
  76. }
  77.  
  78. int mmd8_uleft(int h, int w, int g[h][w], int x, int y, int steps)
  79. {
  80.     if (base_case(h,w,x,y)) return 0;
  81.     putchar('W');
  82.     return max2(g[x][y]?steps:0,
  83.            mmd8_uleft(h,w,g,x-1,y-1,steps+1));
  84. }
  85.  
  86. int mmd8_uright(int h, int w, int g[h][w], int x, int y, int steps)
  87. {
  88.     if (base_case(h,w,x,y)) return 0;
  89.     putchar('X');
  90.     return max2(g[x][y]?steps:0,
  91.            mmd8_uright(h,w,g,x-1,y+1,steps+1));
  92. }
  93.  
  94. int mmd8_dleft(int h, int w, int g[h][w], int x, int y, int steps)
  95. {
  96.     if (base_case(h,w,x,y)) return 0;
  97.     putchar('Y');
  98.     return max2(g[x][y]?steps:0,
  99.            mmd8_dleft(h,w,g,x+1,y-1,steps+1));
  100. }
  101.  
  102. int mmd8_dright(int h, int w, int g[h][w], int x, int y, int steps)
  103. {
  104.     if (base_case(h,w,x,y)) return 0;
  105.     putchar('Z');
  106.     return max2(g[x][y]?steps:0,
  107.            mmd8_dright(h,w,g,x+1,y+1,steps+1));
  108. }
  109.  
  110. // 4-way Solution
  111.  
  112. int mmd4(int h, int w, int g[h][w], int x, int y)
  113. {
  114.     putchar('#');
  115.     return max4(mmd_up   (h,w,g,x-1,y  ,1),
  116.                 mmd_down (h,w,g,x+1,y  ,1),
  117.                 mmd_left (h,w,g,x  ,y-1,1),
  118.                 mmd_right(h,w,g,x  ,y+1,1));
  119. }
  120.  
  121. int mmd_up(int h, int w, int g[h][w], int x, int y, int steps)
  122. {
  123.     if (base_case(h,w,x,y)) return 0;
  124.     putchar('U');
  125.     return max4(g[x][y]?steps:0,
  126.            mmd_up   (h,w,g,x-1,y  ,steps+1),
  127.            mmd_left (h,w,g,x  ,y-1,steps+1),
  128.            mmd_right(h,w,g,x  ,y+1,steps+1));
  129. }
  130.  
  131. int mmd_down(int h, int w, int g[h][w], int x, int y, int steps)
  132. {
  133.     if (base_case(h,w,x,y)) return 0;
  134.     putchar('D');
  135.     return max4(g[x][y]?steps:0,
  136.            mmd_down (h,w,g,x+1,y  ,steps+1),
  137.            mmd_left (h,w,g,x  ,y-1,steps+1),
  138.            mmd_right(h,w,g,x  ,y+1,steps+1));
  139. }
  140.  
  141. int mmd_left(int h, int w, int g[h][w], int x, int y, int steps)
  142. {
  143.     if (base_case(h,w,x,y)) return 0;
  144.     putchar('L');
  145.     return max2(g[x][y]?steps:0,
  146.            mmd_left (h,w,g,x  ,y-1,steps+1));
  147. }
  148.  
  149. int mmd_right(int h, int w, int g[h][w], int x, int y, int steps)
  150. {
  151.     if (base_case(h,w,x,y)) return 0;
  152.     putchar('R');
  153.     return max2(g[x][y]?steps:0,
  154.            mmd_right(h,w,g,x  ,y+1,steps+1));
  155. }
  156.  
  157. // Utility Functions
  158.  
  159. int base_case(int h, int w, int x, int y)
  160. {
  161. 	if (x < 0) return 1;
  162. 	if (y < 0) return 1;
  163. 	if (x >= h) return 1;
  164. 	if (y >= w) return 1;
  165.     return 0;
  166. }
  167.  
  168. int max2(int a, int b)
  169. {
  170.     return ((a > b) ? a : b);
  171. }
  172.  
  173. int max4(int a, int b, int c, int d)
  174. {
  175.     int m = a;
  176.     if (b > m) m = b;
  177.     if (c > m) m = c;
  178.     if (d > m) m = d;
  179.     return m;
  180. }
  181.  
  182. int max8(int a, int b, int c, int d, int e, int f, int g, int h)
  183. {
  184.     int m = a;
  185.     if (b > m) m = b;
  186.     if (c > m) m = c;
  187.     if (d > m) m = d;
  188.     if (e > m) m = e;
  189.     if (f > m) m = f;
  190.     if (g > m) m = g;
  191.     if (h > m) m = h;
  192.     return m;
  193. }
  194.  
Success #stdin #stdout 0s 2160KB
comments (?)
stdin 
Standard input is empty
stdout 
#RRLLDRRLLDRRLLURRLLURRLL
 4-way solution = 4 
#ZZYYXXWWRZXRLYWLDZYDUXWU
 8-way solution = 2
https://ideone.com/Ywt3y4
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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