View Compilation Error

0_0_21856130_10391.cpp: In function 'int main()':
0_0_21856130_10391.cpp:51:21: error: request for member 'clear' in 'g[0]', which is of non-class type 'std::vector<data> [200500]'
    clr(pre,0); g[0].clear(); g[1].clear();
                     ^
0_0_21856130_10391.cpp:51:35: error: request for member 'clear' in 'g[1]', which is of non-class type 'std::vector<data> [200500]'
    clr(pre,0); g[0].clear(); g[1].clear();
                                   ^