View Compilation Error

0_0_29227343_1373.cpp: In function 'int main()':
0_0_29227343_1373.cpp:54:22: error: unable to find numeric literal operator 'operator""b'
    a[i]=lower_bound(+1b,b+len+1,a[i])-b;
                      ^
0_0_29227343_1373.cpp:54:22: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes