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  1. #include <stdio.h>
  2. #include <stdint.h>
  3. #include <limits.h>
  4. #include <unistd.h>
  5.  
  6. #define push(a, b)  *a = b; a++
  7. #define pop(a, b)   a--; b = *a
  8.  
  9. const char n[] = {'N', 'O'};
  10. const char y[] = {'Y', 'E', 'S'};
  11.  
  12. unsigned char arr[100*1024+1] = {};
  13.  
  14. int main(void)
  15. {
  16.   unsigned char * arr_p= &arr[0];
  17.   unsigned char tmp;
  18.   unsigned char *c = &arr[0];
  19.  
  20.   read(STDIN_FILENO, arr, sizeof(arr));
  21.  
  22.   while (1)
  23.   {
  24.     switch (*c)
  25.     {
  26.       case '<':
  27.       case '{':
  28.       case '[':
  29.       case '(':
  30.         push (arr_p, *c);
  31.         break;
  32.  
  33.       case '>':
  34.       case '}':
  35.       case ']':
  36.         pop (arr_p, tmp);
  37.         if (tmp != *c - 2)
  38.         {
  39.           write(STDOUT_FILENO, n, sizeof(n));
  40.           return 0;
  41.         }
  42.         break;
  43.  
  44.       case ')':
  45.         pop (arr_p, tmp);
  46.         if (tmp != *c - 1)
  47.         {
  48.           write(STDOUT_FILENO, n, sizeof(n));
  49.           return 0;
  50.         }
  51.         break;
  52.  
  53.       default:
  54.         if ( arr_p != &arr[0] )
  55.           write(STDOUT_FILENO, n, sizeof(n));
  56.         else
  57.           write(STDOUT_FILENO, y, sizeof(y));
  58.         return 0;
  59.       }
  60.       ++c;
  61.   }
  62.   return 0;
  63. }
Success #stdin #stdout 0s 1928KB
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YES
https://ideone.com/hz8ZNF
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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