View Compilation Error

0_0_30873628_17844.cpp: In function 'int main()':
0_0_30873628_17844.cpp:80:11: error: unable to find numeric literal operator 'operator""ll'
   if(disn>1e9ll)
           ^
0_0_30873628_17844.cpp:80:11: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes