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C/C++ code:
#ifndef _GLIBCXX_CSTDDEF
#define _GLIBCXX_CSTDDEF 1

#pragma GCC system_header

#include <stddef.h>

namespace std
{
using ::ptrdiff_t;
using ::size_t;
}

#endif

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C/C++ code:
#ifndef _GLIBCXX_CSTDDEF
#define _GLIBCXX_CSTDDEF 1

#pragma GCC system_header

namespace std
{
#include <stddef.h>
}

#endif

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namespace std
{
  using ::ptrdiff_t;
  using ::size_t;
}
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typedef int BTG;//È«¾Ö
namespace std
{
using ::BTG; //stdÃû×Ö¿Õ¼ä
}
int main()
{
std::BTG s; //ʹÓÃstdÃû×Ö¿Õ¼äµÄ·ûºÅ
BTG a; //È«¾Ö·ûºÅ
}

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#include <stdio.h>
#include <graphics.h>
void main()
{
  int x0,y0,x1,y1,driver,mode,i;
  driver=VGA;
  mode=VGAHI;
  initgraph(&driver,&mode,&qu ......

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#include <stdio.h>
int main()
{
  char x, y, z;
  int i;
  int a[16];
  for(i=0; i<=16; i++)
  {
  a[i] = 0;
  ......
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