View Compilation Error

0_0_20973655_4111.cpp: In function 'void init()':
0_0_20973655_4111.cpp:74:12: error: unable to find numeric literal operator 'operator""li'
  for(int i=1li<=n;i++) g[i].clear();
            ^
0_0_20973655_4111.cpp:74:12: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
0_0_20973655_4111.cpp:74:22: error: expected ';' before ')' token
  for(int i=1li<=n;i++) g[i].clear();
                      ^