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  1. #include <stdio.h>
  2.  
  3. int decode(char* message, size_t len) {
  4.     int i, w, ways[] = { 1, 0 };
  5.     for(i = 0, w; i < len; ++i) {
  6.         w = 0;
  7.         if((i > 0) && ((message[i - 1] == '1') || (message[i - 1] == '2' && message[i] < '7'))) {
  8.             w += ways[1];
  9.         }
  10.         if(message[i] > '0') {
  11.             w += ways[0];
  12.         }
  13.         ways[1] = ways[0];
  14.         ways[0] = w;
  15.     }
  16.     return ways[0];
  17. }
  18.  
  19. int main(void) {
  20.     printf("%d\n", decode("1090", 4));
  21.     printf("%d\n", decode("12321", 5));
  22.     return 0;
  23. }
Success #stdin #stdout 0s 1832KB
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https://ideone.com/h751xP
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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