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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.   unsigned char inbuff[2500000]; /* To be certain there's no overflow here */
  9.   unsigned char *in = inbuff;
  10.   char outbuff[2500000]; /* To be certain there's no overflow here */
  11.   char *out = outbuff;
  12.  
  13.   int c = 0;
  14.  
  15.   while(1) {
  16.     i = j = 0;
  17.  
  18.     inbuff[fread(inbuff, 1, 2500000, stdin)] = '\0';
  19.  
  20.     /* Skip whitespace before first number and check if end of input */
  21.     do {
  22.       c = *(in++);
  23.     } while(c != '\0' && !(c >= '0' && c <= '9'));
  24.  
  25.     /* If end of input, print answer and return */
  26.     if(c == '\0') {
  27.       *(--out) = '\0';
  28.       puts(outbuff);
  29.       return 0;
  30.     }
  31.  
  32.     /* Read first integer */
  33.     do {
  34.       i = 10 * i + (c - '0');
  35.       c = *(in++);
  36.     } while(c >= '0' && c <= '9');
  37.  
  38.     /* Skip whitespace between first and second integer */
  39.     do {
  40.       c = *(in++);
  41.     } while(!(c >= '0' && c <= '9'));
  42.  
  43.     /* Read second integer */
  44.     do {
  45.       j = 10 * j + (c - '0');
  46.       c = *(in++);
  47.     } while(c >= '0' && c <= '9');
  48.  
  49.     if(i > j)
  50.       res = i-j;
  51.     else
  52.       res = j-i;
  53.  
  54.     /* Buffer answer */
  55.     unsigned long long divisor = 1000000000;
  56.     /* Skip trailing 0s until the last one */
  57.     while(res / divisor == 0 && divisor >= 10) {
  58.       divisor /= 10;
  59.     }
  60.     /* Buffer digits */
  61.     while(divisor != 0) {
  62.       unsigned long long digit = res / divisor;
  63.       *(out++) = digit + '0';
  64.       res -= divisor * digit;
  65.       divisor /= 10;
  66.     }
  67.     *(out++) = '\n';
  68.   }
  69. }
Success #stdin #stdout 0s 15072KB
comments (?)
stdin
copy 
10 12
10 14
100 200
100 100
0 0
4294967296 0
4294967296 4294967296
stdout
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2
4
100
0
0
4294967296
0
https://ideone.com/oDKczC
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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