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FILE *fA;fA=fopen("A","rb+");_fseeki64(fA,10000000000i64*sizeof(int),SEEK_SET);fputc(fA,0);//int A[10000000000];
int B;
_fseeki64(fA,9999999999i64*sizeof(int),SEEK_SET);fread(&B,1,sizeof(int),fA);//B=A[9999999999];
_fseeki64(fA,9999999999i64*sizeof(int),SEEK_SET);fwrite(&B,1,sizeof(int),fA);//A[9999999999]=B;
fclose(fA);