View Compilation Error

0_0_22363799_21614.cpp: In function 'int main()':
0_0_22363799_21614.cpp:93:62: error: 'gao' was not declared in this scope
         printf("%lld\n",gao(VI{1,5,11,36,95,281,781,2245},n-1));
                                                              ^
0_0_22363799_21614.cpp:93:62: note: suggested alternative:
0_0_22363799_21614.cpp:83:8: note:   'linear_seq::gao'
     ll gao(VI a,ll n) {
        ^