View Compilation Error

0_0_37448000_17825.cpp: In function 'int main()':
0_0_37448000_17825.cpp:117:24: error: unable to find numeric literal operator 'operator""x'
         int l = 0, r = 4444444x;
                        ^
0_0_37448000_17825.cpp:117:24: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes