View Compilation Error

0_0_19560149_20584.cpp: In function 'void dfs(int, int, int)':
0_0_19560149_20584.cpp:55:24: error: return-statement with a value, in function returning 'void' [-fpermissive]
                 return 0;
                        ^
0_0_19560149_20584.cpp:58:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return 0;
            ^