View Compilation Error

0_0_26347583_4586.cpp: In member function 'int Dinic::dfs(int, int)':
0_0_26347583_4586.cpp:66:81: error: 'DFS' was not declared in this scope
             if (d[ed.to] == d[x] + 1 && (f = DFS(ed.to, min(a, ed.cap - ed.flow))) > 0) {
                                                                                 ^