docs/history/15-o3/code/io_linux.c


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#include <stdio.h>
int J;
static int pk(void){int c=getchar();ungetc(c,stdin);return c==EOF;}
char Q(void){int c=getchar();J=pk();return c;}
void G(char c){putchar(c);}
__attribute__((constructor)) static void init(void){J=pk();}