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FILE* fin=fopen("fisier.in","r");
const unsigned maxb=30000192;
char buf[maxb];
unsigned ptr=maxb;
 
inline unsigned getInt(){
    unsigned nr=0;
    while(buf[ptr]<'0'||'9'<buf[ptr])
    if(++ptr>=maxb)
        fread(buf,maxb,1,fin),ptr=0;
    while('0'<=buf[ptr]&&buf[ptr]<='9'){
        nr=nr*10+buf[ptr]-'0';
        if(++ptr>=maxb)
            fread(buf,maxb,1,fin),ptr=0;
    }
    return nr;
}

prog.c:1:1: error: unknown type name ‘FILE’
 FILE* fin=fopen("fisier.in","r");
 ^~~~
prog.c:1:11: warning: implicit declaration of function ‘fopen’ [-Wimplicit-function-declaration]
 FILE* fin=fopen("fisier.in","r");
           ^~~~~
prog.c:1:11: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
prog.c:1:11: error: initializer element is not constant
prog.c:3:6: error: variably modified ‘buf’ at file scope
 char buf[maxb];
      ^~~
prog.c:4:14: error: initializer element is not constant
 unsigned ptr=maxb;
              ^~~~
prog.c: In function ‘getInt’:
prog.c:10:9: warning: implicit declaration of function ‘fread’ [-Wimplicit-function-declaration]
         fread(buf,maxb,1,fin),ptr=0;
         ^~~~~

Standard output is empty