fork(1) download
copy 
  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.     fseek(stdin, 0, SEEK_END);
  19.     long inputsize = ftell(stdin);
  20.     rewind(stdin);
  21.     fread(inbuff, inputsize, 1, stdin);
  22.     inbuff[inputsize] = '\0';
  23.  
  24.     /* Skip whitespace before first number and check if end of input */
  25.     do {
  26.       c = *(in++);
  27.     } while(c != '\0' && !(c >= '0' && c <= '9'));
  28.  
  29.     /* If end of input, print answer and return */
  30.     if(c == '\0') {
  31.       *(--out) = '\0';
  32.       puts(outbuff);
  33.       return 0;
  34.     }
  35.  
  36.     /* Read first integer */
  37.     do {
  38.       i = 10 * i + (c - '0');
  39.       c = *(in++);
  40.     } while(c >= '0' && c <= '9');
  41.  
  42.     /* Skip whitespace between first and second integer */
  43.     do {
  44.       c = *(in++);
  45.     } while(!(c >= '0' && c <= '9'));
  46.  
  47.     /* Read second integer */
  48.     do {
  49.       j = 10 * j + (c - '0');
  50.       c = *(in++);
  51.     } while(c >= '0' && c <= '9');
  52.  
  53.     if(i > j)
  54.       res = i-j;
  55.     else
  56.       res = j-i;
  57.  
  58.     /* Buffer answer */
  59.     unsigned long long divisor = 1000000000;
  60.     /* Skip trailing 0s until the last one */
  61.     while(res / divisor == 0 && divisor >= 10) {
  62.       divisor /= 10;
  63.     }
  64.     /* Buffer digits */
  65.     while(divisor != 0) {
  66.       unsigned long long digit = res / divisor;
  67.       *(out++) = digit + '0';
  68.       res -= divisor * digit;
  69.       divisor /= 10;
  70.     }
  71.     *(out++) = '\n';
  72.   }
  73. }
Success #stdin #stdout 0s 14176KB
comments (?)
stdin
copy 
10 12
10 14
100 200
100 100
0 0
4294967296 0
4294967296 4294967296
stdout
copy 
2
4
100
0
0
4294967296
0
https://ideone.com/Nc3Z5D
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!