View Compilation Error

0_0_18244166_6731.cpp: In function 'void bfs(int*, std::queue<Position>*, int, std::vector<int>*)':
0_0_18244166_6731.cpp:22:77: error: 'find' was not declared in this scope
    if (Now.Node != i && find(Line[Now.Node].begin(), Line[Now.Node].end(), i) == Line[Now.Node].end() && ans[i] == -1)
                                                                             ^