View Compilation Error

0_0_37381534_8678.cpp: In function 'int main()':
0_0_37381534_8678.cpp:6:21: error: unable to find numeric literal operator 'operator""f'
         f[i]=f[i-1]+2f[i-2];
                     ^
0_0_37381534_8678.cpp:6:21: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes