View Compilation Error

0_0_37173074_28803.cpp:3:14: error: unable to find numeric literal operator 'operator""a0'
 int n,a,b,pf[10000a0],ct;
              ^
0_0_37173074_28803.cpp:3:14: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
0_0_37173074_28803.cpp: In function 'void p_f(int)':
0_0_37173074_28803.cpp:10:4: error: 'pf' was not declared in this scope
    pf[ct++] = i;
    ^
0_0_37173074_28803.cpp:19:3: error: 'pf' was not declared in this scope
   pf[ct++] = x;
   ^
0_0_37173074_28803.cpp: In function 'long long int rc(int, int)':
0_0_37173074_28803.cpp:32:25: error: 'pf' was not declared in this scope
                  tmp *= pf[j];
                         ^