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0_0_35017468_11506.c:1:182: fatal error: cstdio: No such file or directory
 #include<cstdio> int main() {__int64 a,b; while(scanf("%I64X%I64X",&a,&b)!=EOF)     {__int64 s;     s=a+b;     if(s<0) {s=-s;printf("-");}     printf("%I64X\n",s);     } return 0; }
                                                                                                                                                                                      ^
compilation terminated.