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  1. #include <stdio.h>
  2.  
  3. void getdigits(char buf[], int n)
  4. {
  5.     while (n) {
  6. 		*buf++ = n % 10;
  7. 		n /= 10;
  8. 	}
  9. }
  10.  
  11. int is_vampire(const char n[4], const char i[2], const char j[2])
  12. {
  13.     	/* maybe a bit faster if unrolled manually */
  14.     	if (i[0] == n[0]
  15.     	 && i[1] == n[1]
  16.     	 && j[0] == n[2]
  17.     	 && j[1] == n[3])
  18. 		        return 1;
  19.  
  20.         if (i[0] == n[0]
  21.          && i[1] == n[1]
  22.          && j[0] == n[3]
  23.          && j[1] == n[2])
  24.                 return 1;
  25.  
  26.         if (i[0] == n[0]
  27.          && i[1] == n[2]
  28.          && j[0] == n[1]
  29.          && j[1] == n[3])
  30.                 return 1;
  31.  
  32.         if (i[0] == n[0]
  33.          && i[1] == n[2]
  34.          && j[0] == n[3]
  35.          && j[1] == n[1])
  36.                 return 1;
  37.  
  38.         if (i[0] == n[0]
  39.          && i[1] == n[3]
  40.          && j[0] == n[1]
  41.          && j[1] == n[2])
  42.                 return 1;
  43.  
  44.         if (i[0] == n[0]
  45.          && i[1] == n[3]
  46.          && j[0] == n[2]
  47.          && j[1] == n[1])
  48.                 return 1;
  49.  
  50.  
  51.         if (i[0] == n[1]
  52.          && i[1] == n[0]
  53.          && j[0] == n[2]
  54.          && j[1] == n[3])
  55.                 return 1;
  56.  
  57.         if (i[0] == n[1]
  58.          && i[1] == n[0]
  59.          && j[0] == n[3]
  60.          && j[1] == n[2])
  61.                 return 1;
  62.  
  63.         if (i[0] == n[1]
  64.          && i[1] == n[2]
  65.          && j[0] == n[0]
  66.          && j[1] == n[3])
  67.                 return 1;
  68.  
  69.         if (i[0] == n[1]
  70.          && i[1] == n[2]
  71.          && j[0] == n[3]
  72.          && j[1] == n[0])
  73.                 return 1;
  74.  
  75.         if (i[0] == n[1]
  76.          && i[1] == n[3]
  77.          && j[0] == n[0]
  78.          && j[1] == n[2])
  79.                 return 1;
  80.  
  81.         if (i[0] == n[1]
  82.          && i[1] == n[3]
  83.          && j[0] == n[2]
  84.          && j[1] == n[0])
  85.                 return 1;
  86.  
  87.         if (i[0] == n[2]
  88.          && i[1] == n[0]
  89.          && j[0] == n[1]
  90.          && j[1] == n[3])
  91.                 return 1;
  92.  
  93.         if (i[0] == n[2]
  94.          && i[1] == n[0]
  95.          && j[0] == n[3]
  96.          && j[1] == n[1])
  97.                 return 1;
  98.  
  99.         if (i[0] == n[2]
  100.          && i[1] == n[1]
  101.          && j[0] == n[0]
  102.          && j[1] == n[3])
  103.                 return 1;
  104.  
  105.         if (i[0] == n[2]
  106.          && i[1] == n[1]
  107.          && j[0] == n[3]
  108.          && j[1] == n[0])
  109.                 return 1;
  110.  
  111.         if (i[0] == n[2]
  112.          && i[1] == n[3]
  113.          && j[0] == n[0]
  114.          && j[1] == n[1])
  115.                 return 1;
  116.  
  117.         if (i[0] == n[2]
  118.          && i[1] == n[3]
  119.          && j[0] == n[1]
  120.          && j[1] == n[0])
  121.                 return 1;
  122.  
  123.         if (i[0] == n[3]
  124.          && i[1] == n[0]
  125.          && j[0] == n[1]
  126.          && j[1] == n[2])
  127.                 return 1;
  128.  
  129.         if (i[0] == n[3]
  130.          && i[1] == n[0]
  131.          && j[0] == n[2]
  132.          && j[1] == n[1])
  133.                 return 1;
  134.  
  135.         if (i[0] == n[3]
  136.          && i[1] == n[1]
  137.          && j[0] == n[0]
  138.          && j[1] == n[2])
  139.                 return 1;
  140.  
  141.         if (i[0] == n[3]
  142.          && i[1] == n[1]
  143.          && j[0] == n[2]
  144.          && j[1] == n[0])
  145.                 return 1;
  146.  
  147.         if (i[0] == n[3]
  148.          && i[1] == n[2]
  149.          && j[0] == n[0]
  150.          && j[1] == n[1])
  151.                 return 1;
  152.  
  153.         if (i[0] == n[3]
  154.          && i[1] == n[2]
  155.          && j[0] == n[1]
  156.          && j[1] == n[0])
  157.                 return 1;
  158.  
  159. 	return 0;
  160. }
  161.  
  162. int main()
  163. {
  164. 	for (int i = 10; i < 100; i++) {
  165. 		for (int j = 10; j < 100; j++) {
  166. 			int n = i * j;
  167. 			if (n < 1000)
  168. 				continue;
  169.  
  170. 			char ndigits[4];
  171. 			getdigits(ndigits, n);
  172.  
  173. 			char idigits[2];
  174. 			char jdigits[2];
  175. 			getdigits(idigits, i);
  176. 			getdigits(jdigits, j);
  177.  
  178. 			if (is_vampire(ndigits, idigits, jdigits))
  179. 				printf("%d * %d = %d\n", i, j, n);
  180. 		}
  181. 	}
  182.  
  183. 	return 0;
  184. }
  185.  
Success #stdin #stdout 0s 1792KB
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stdin
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Standard input is empty
stdout
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15 * 93 = 1395
21 * 60 = 1260
21 * 87 = 1827
27 * 81 = 2187
30 * 51 = 1530
35 * 41 = 1435
41 * 35 = 1435
51 * 30 = 1530
60 * 21 = 1260
80 * 86 = 6880
81 * 27 = 2187
86 * 80 = 6880
87 * 21 = 1827
93 * 15 = 1395
https://ideone.com/kvz9MZ
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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