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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. int main()
  5. {
  6.   unsigned long long int i, j, res;
  7.  
  8.   char outbuff[2500000]; /* To be certain there's no overflow here */
  9.   char *out = outbuff;
  10.  
  11.   int c = 0;
  12.  
  13.   while(1) {
  14.     i = j = 0;
  15.  
  16.     /* Skip whitespace before first number and check if end of input */
  17.     do {
  18.       c = getchar();
  19.     } while(c != EOF && !(c >= '0' && c <= '9'));
  20.  
  21.     /* If end of input, print answer and return */
  22.     if(c == EOF) {
  23.       *(--out) = '\0';
  24.       puts(outbuff);
  25.       return 0;
  26.     }
  27.  
  28.     /* Read first integer */
  29.     do {
  30.       i = 10 * i + (c - '0');
  31.       c = getchar();
  32.     } while(c >= '0' && c <= '9');
  33.  
  34.     /* Skip whitespace between first and second integer */
  35.     do {
  36.       c = getchar();
  37.     } while(!(c >= '0' && c <= '9'));
  38.  
  39.     /* Read second integer */
  40.     do {
  41.       j = 10 * j + (c - '0');
  42.       c = getchar();
  43.     } while(c >= '0' && c <= '9');
  44.  
  45.     if(i > j)
  46.       res = i-j;
  47.     else
  48.       res = j-i;
  49.  
  50.     /* Buffer answer */
  51.     unsigned long long divisor = 1000000000;
  52.     /* Skip trailing 0s until the last one */
  53.     while(res / divisor == 0 && divisor >= 10) {
  54.       divisor /= 10;
  55.     }
  56.     /* Buffer digits */
  57.     while(divisor != 0) {
  58.       unsigned long long digit = res / divisor;
  59.       *(out++) = digit + '0';
  60.       res -= divisor * digit;
  61.       divisor /= 10;
  62.     }
  63.     *(out++) = '\n';
  64.   }
  65. }
Success #stdin #stdout 0s 11736KB
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stdout
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https://ideone.com/X8utoK
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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