View Compilation Error

0_0_4514664_16128.cpp:21: error: expected unqualified-id before '{' token
0_0_4514664_16128.cpp:21: error: expected `,' or `;' before '{' token
0_0_4514664_16128.cpp: In function `int main()':
0_0_4514664_16128.cpp:80: error: `dfs' undeclared (first use this function)
0_0_4514664_16128.cpp:80: error: (Each undeclared identifier is reported only once for each function it appears in.)