View Compilation Error

0_0_26736085_13623.cpp: In function 'int main()':
0_0_26736085_13623.cpp:38:43: error: 'dfs' was not declared in this scope
             if ((!match[rnd]) && (!dfs(rnd))){
                                           ^
0_0_26736085_13623.cpp: In function 'int bfs(int)':
0_0_26736085_13623.cpp:57:46: error: 'dfs' was not declared in this scope
         if (!inv_match[v] || dfs(inv_match[v])){
                                              ^