View Compilation Error

0_0_20333538_19957.cpp: In function 'void dfs(int, long long int, int)':
0_0_20333538_19957.cpp:27:16: error: return-statement with a value, in function returning 'void' [-fpermissive]
         return 0;
                ^
0_0_20333538_19957.cpp:29:16: error: return-statement with a value, in function returning 'void' [-fpermissive]
         return 0;
                ^